276. MACHINES: The screw slideshow

Stories:

• 283. PHILOSOPHY: An explanation of ancient Chinese philosophy December 18, 2025
• 282. ART: Noche yage December 15, 2025
• 281. MACHINES: Field trip to the Penngrove Power and Implement Museum November 5, 2025
• 280. MACHINES: Ways to move liquids – one way valves, propellers, impellers, pumps etc. slideshow October 27, 2025
• 279. MACHINES: Farming – the transition from humans and animals to internal combustion engines October 27, 2025
• 278. MACHINES: Glues cement ropes clamps slideshow October 27, 2025
• 277. SURFING: Surf notes in three sections Fall 2025 October 7, 2025
• 276. MACHINES: The screw slideshow September 22, 2025
• 275. MACHINES: Sturgeon’s Mill in Sebastopol, Sonoma County September 15, 2025
• 274. MACHINES: The Pulley September 8, 2025
• 273. MACHINES: The Wheel slideshow September 3, 2025
• 272. MAINTENANCE: Body mechanics slideshow August 26, 2025
• 271. MACHINES: The lever slideshow August 25, 2025
• 270. ART: Show and storytelling August 18, 2025
• 269. MACHINES: The wedge slideshow August 18, 2025
• 268. SURFING: Good surfer August 6, 2025
• 267. PROPAGATION & TAXONOMY: Two species of lavenders – a slideshow May 12, 2025
• 266. ART: The Lord of the Northern Skies for the Blackfeet Nation – in the vicinity of Two Medicine and Milk Rivers April 27, 2025
• 265. DESIGN: A picture tour through a section of the Civic Center Complex in San Francisco April 22, 2025
• 264. MAINTENANCE: Compost & recycling -slideshow with notes March 10, 2025
• 263. DESIGN: St Francis of the Guns Garden at City College of San Francisco 50 Frida Kahlo Way February 21, 2025
• 262. DESIGN: Slopes slideshow – Walls, decks, stairs February 7, 2025
• 261. DESIGN: Hardscape slideshow January 30, 2025
• 260. GREENHOUSE PRODUCTION: Structure -Question and answer drawings followed by a slideshow January 22, 2025
• 259. GREENHOUSE PRODUCTION: History slideshow January 9, 2025
• 258. GREENHOUSE PRODUCTION: Slideshow about the industry January 9, 2025
• 257. ART: Up by Snake River in Oregon and Idaho with the Shoshone and Paiute December 13, 2024
• 256. ART: Hopi mythology in Arizona near them Four Corners November 29, 2024
• 255. SPIRIT MEDICINE: Drinkin yage with a lil bird – links and opportunity November 15, 2024
• 254. PROPAGATION: Bulbs slideshow November 6, 2024
• 253. DESIGN: a really longwinded essay about hardscape construction and maintenance October 21, 2024
• 252. PROPAGATION: Slideshow on food crops of the Andes October 20, 2024
• 251. PROPAGATION: Slideshow about the Mesoamerica cloud forest October 2, 2024
• 250. PROPAGATION: Slideshow about an annual called Cannabis September 19, 2024
• 249. PROPAGATION: Slideshow about seeds September 19, 2024
• 248. PROPAGATION: Propagation environment slideshow September 3, 2024
• 247. PROPAGATION: Slideshow about genetics and plant breeding and such September 3, 2024
• 246. DESIGN: Slideshow about drainage, sewers, runoff, culverts, canals, and so forth August 19, 2024
• 245. DESIGN: Slideshow about designing irrigation systems… August 19, 2024
• 244. DESIGN: Reading & drawing irrigation plans August 19, 2024
• 243. PROPAGATION: Slide lecture about how we started growing plants and sowing seeds… August 18, 2024
• 242. ART: Somewhere between Sonora and the Gila River – thanks to the O’odham June 11, 2024
• 241. PESTICIDES: Organochlorine nerve poisons June 5, 2024
• 240. ART: Spirits of the river – along the Aguarico of the Ecuadorian Amazon May 11, 2024
• 239. ART: Island Endemics Institute and bird conservation April 5, 2024
• 238. TREES: addendum to CMGH ‘Woody Landscape Plants’ chapter April 1, 2024
• 237: MEMOIR: Gus Broucaret’s adventures March 15, 2024
• 236. GREENHOUSE PRODUCTION: Three types of Begonias based on their root/stem systems March 5, 2024
• 235. PRAYER: For lunar year of the dragon 2024 February 28, 2024
• 234: MAINTENANCE: Cool season turf grasses -basic & easy identification February 5, 2024
• 233. ART: Hundred pacer – a Bunun tribe story February 3, 2024
• 232. ART: Manifestation of the magi – for the Siona, Siekopa’ai , Cofan and the Huaorani Nations January 21, 2024
• 231. GREENHOUSE PRODUCTION: Arums/Araceae we grow indoors and outdoors around these parts January 17, 2024
• 230. SPIRIT MEDICINE: Hikuri Lophophora – grateful for the Huichol gate keepers November 16, 2023
• 229. GARDENING: Importance of Nitrogen September 26, 2023
• 228. DESIGN: Stone work in the Iberian Peninsula August 27, 2023
• 227. SPIRIT MEDICINE: Shrooms – not in the lineage but in gratitude for the Mazatecs July 18, 2023
• 226. MAPS & BROCHURES: Natural Areas Program July 18, 2023
• 225. WALKABOUT: China July 14, 2023
• 224. BOTANY: Eight common Chinese street trees July 7, 2023
• 223. DESIGN: Gardens and landscapes of a town in northern China June 14, 2023
• 222. DESIGN: Restoration of the native landscape May 13, 2023
• 221. FISH: Lamprey story of the Yakama Nation February 26, 2023
• 220. ART: Mayo deer dance – from Sonora and Sinaloa January 10, 2023
• 219. ART: La liana de Yage (Versión en español) January 9, 2023
• 218. ART: Yage vines (English version) January 5, 2023
• 217. ART: Apache pastures – from the plains of Oklahoma October 7, 2022
• 216. ART: Seri trees and tales – from Sonora and the Gulf of California September 18, 2022
• 215. ART: Huaorani origin myth (3 of 3) -from the Oriente of Ecuadorian Amazon August 18, 2022
• 214. ART: Huaorani origin myth (2 of 3) -from the Oriente of Ecuadorian Amazon August 6, 2022
• 213. ART: Desert ecosystem of the Seris of Sonora and Gulf of California August 1, 2022
• 212. ART: Zzyzx in the Mojave Desert July 30, 2022
• 211. ART: Huaorani origin myth (1 of 3) – from the Oriente of Ecuadorian Amazon July 25, 2022
• 210. MYTHOLOGY: Traditional Seri religion – Sonora and Gulf of California July 22, 2022
• 209. ART: Rainforest medicine in the Ecuadorian Amazon July 20, 2022
• 208. ART: Our Lady of Black’s Beach in San Diego, California July 6, 2022
• 207. MISSION BLUE PROJECT: Territory July 6, 2022
• 206. MISSION BLUE PROJECT: Blue kin July 6, 2022
• 205. MISSION BLUE PROJECT: Lupines July 6, 2022
• 204. MISSION BLUE PROJECT: Butterfly lifecycle July 6, 2022
• 203. ART: Old black and white sketches of birds butterflies and such June 22, 2022
• 202. BOTANY: SFBG 2014 Plants R – Z June 22, 2022
• 201. BOTANY: SFBG 2014 Plants L – Q June 9, 2022
• 200. BOTANY: SFBG 2014 Plants F-L June 9, 2022
• 199. BOTANY: SFBG 2014 Plants C-E May 27, 2022
• 198. BOTANY: SFBG 2014 Plants A-B May 9, 2022
• 197. PROPAGATION: Diet of a couple of upland game birds in December on the Cali central coast May 8, 2022
• 196. MAINTENANCE: Safety and injuries May 8, 2022
• 195. ART: Old times are new again for San Bruno Mountain Watch April 1, 2022
• 194. ART: Calling all fishermen from inland lakes sierran rivers to the pacific ocean March 7, 2022
• 193. DESIGN & BUILD: A sunset backyard in San Francisco February 25, 2022
• 192. MAINTENANCE: Mammalian & bird pests February 25, 2022
• 191. MAINTENANCE: Tool final fall semester December 6, 2021
• 190. DESIGN: Sacred gardens November 18, 2021
• 189. DESIGN: Water features November 1, 2021
• 188. CULTURE: Online horticulture education October 26, 2021
• 187. DESIGN: Hardscape and edges – talkin about the border or frame of that landscape creation October 10, 2021
• 186. GREENHOUSE PRODUCTION: Day length October 10, 2021
• 185. GEOGRAPHY: California counties September 17, 2021
• 184. PLANTS: California ethnobotany August 13, 2021
• 183. MAINTENANCE: Spring tool, equipment, and supplies – Final Exam May 14, 2021
• 182. DESIGN: Field trip to Filoli in Woodside, California May 10, 2021
• 181. MAINTENANCE: Tool handles April 5, 2021
• 180. EDUCATION: City College of San Francisco April 1, 2021
• 179. WEEDS: Blackberry Rubus armeniacus March 2, 2021
• 178. PROPAGATION: California native plants March 2, 2021
• 177. MAINTENANCE: Irrigation valves etc. – simple observations of the circuit and the junctions February 22, 2021
• 176. DESIGN: Observing slopes February 15, 2021
• 175. MAINTENANCE: Turf – distinguishing characteristics, weeds and mowers February 1, 2021
• 174. MAINTENANCE: Hedge and fence notes January 20, 2021
• 173. PROPAGATION: Introduction of old time practices up to more modern methods January 18, 2021
• 172. MAINTENANCE: Gardener conduct and ethics January 17, 2021
• 171. BOTANY: Random notes – Callitroideae taxonomy, Mendocino county game trails, native and non native grasses you see around McLaren Park in San Francisco December 10, 2020
• 170: BOOK REVIEW Weaving the dream from a book about the Pomo Tribe of northern California December 1, 2020
• 169. ART & DESIGN: Landscape painting of a town in Andalucia November 26, 2020
• 168. XERISCAPING: Hedges & lawns. Irrigate like rain. November 20, 2020
• 167. XERISCAPING: Planting for wildlife featuring Dr Don Mahoney November 15, 2020
• 166. XERISCAPING: Local plants and butterfly plants November 10, 2020
• 165. XERISCAPING: Plants from down south like So Cal, Africa and Australia south November 9, 2020
• 164. XERISCAPING: How to plant – timing, berms and combinations November 8, 2020
• 163. XERISCAPING: Succulent and cacti November 5, 2020
• 162. XERISCAPING: Introduction to planting in places where there is sometimes not much water November 3, 2020
• 161. DESIGN: Field trip to San Francisco Botanical Garden October 26, 2020
• 160. GREENHOUSE PRODUCTION: Salts of positive and negative ions October 20, 2020
• 159. GARDENING: drawings of water & soil, drainage and maintenance, hydrozones infiltration percolation and so on October 16, 2020
• 158. DESIGN: Isometric drawing October 10, 2020
• 157. DESIGN: One point perspective drawing October 7, 2020
• 156. GARDENING: Addendum to Chapter 7 Insects CMGH October 4, 2020
• 155. DESIGN: More what plant where? Plant selection based on disease prevalence, growth rate and spacing, and richness diversity community September 29, 2020
• 154. MAINTENANCE: Field propagation September 26, 2020
• 153: GARDENING: Pathology addendum quiz September 26, 2020
• 152. MAINTENANCE: Drainage, erosion control, and mulches September 20, 2020
• 151. GARDENING: Plant pathology September 19, 2020
• 150. MAINTENANCE: Herbaceous perennials September 15, 2020
• 149. GREENHOUSE PRODUCTION: About potting soil ingredients ie Pro Mix September 14, 2020
• 148. DESIGN: Hardscape over time – or – Why won’t things stay put? Why is prep important? Why does mother nature keep planting weeds? September 10, 2020
• 147. GARDENING: Flower parts female and male and variation September 9, 2020
• 146. GREENHOUSE PRODUCTION: Coverings September 5, 2020
• 145. MAINTENANCE: Seeing the world as a tree September 3, 2020
• 144. DESIGN: Hand drawn plans September 1, 2020
• 143. DESIGN: Site inventory and basic drafting August 31, 2020
• 142. MAINTENANCE: Safety August 27, 2020
• 141. GREENHOUSE PRODUCTION: Location August 27, 2020
• 140. GARDENING: CMGH Chapter 2 supplement part II August 25, 2020
• 139. GARDENING: CMGH Chapter 2 supplement part I talking about structures and functions August 24, 2020
• 138. DESIGN: What plant where? August 21, 2020
• 137. MAINTENANCE: Pruning August 21, 2020
• 136. DESIGN: Site survey August 18, 2020
• 135. DESIGN: Basic principles like balance, scale, rhythm and unity August 15, 2020
• 134. GREENHOUSE PRODUCTION: Greenhouse history August 8, 2020
• 133. DESIGN: Section elevation drawings August 6, 2020
• 132. DESIGN: Hardscape & design August 4, 2020
• 131. MAINTENANCE: Compost and recycling in the garden August 3, 2020
• 130. MAINTENANCE: Humans and small engines August 2, 2020
• 129. DESIGN: Garden styles July 28, 2020
• 128. GARDENING: Building rock walls July 20, 2020
• 127. PLANTS: Chaparral July 4, 2020
• 126. SOIL: types of soil May 12, 2020
• 125. CULTURE: God May 11, 2020
• 124. GARDENING: Approaches and attitudes – cartoons April 16, 2020
• 123. PROPAGATION: Chapter 4 Seeds February 5, 2020
• 122. PROPAGATION: Chapter 3 Growing environment January 27, 2020
• 121. PROPAGATION: Chapter 2 Lifecycle and genetics January 27, 2020
• 120. PROPAGATION: Chapter 1 Society and plant use over time January 16, 2020
• 119. GARDENING: Climate and weather January 9, 2020
• 118. PLANTS: Cannabis basics January 8, 2020
• 117. OCEAN: animals from the Sea of Cortez November 23, 2019
• 116. OCEAN: Invertebrate tidal animals November 23, 2019
• 115. GARDENING: More changes at the botanical garden November 13, 2019
• 114. GARDENING: BACK IN THE DAY (At the botanical garden) October 23, 2019
• 113. DESIGN: San Bruno Mountain field trip OH70A September 28, 2019
• 112. DESIGN: OH 70A Class notes day 3 Hardscapes September 9, 2019
• 111. MAINTENANCE: OH53 Class notes day 2 (Safety) & day 3 (insects and fungi) September 9, 2019
• 110. GARDENING: Miscellaneous OH50 notes February 2, 2019
• 109: DESIGN: Maintenance and design February 2, 2019
• 108. WATER: Surfing is not a hobby September 30, 2018
• 107. GARDENING: School gardens and curriculum August 9, 2018
• 106. GARDENING: Integrated Pest Management (IPM) July 19, 2018
• 105. PLANTS: Weeds June 30, 2018
• 104. MYTHOLOGY: Skywoman story from the Iroquois nation May 31, 2018
• 103. PESTICIDES: Nerves & acetylcholine, poisons & horticulture April 14, 2018
• 102. PLANTS: Story cards August 1, 2017
• 101. PLANTS: Basic curriculum June 12, 2017
• 100. MYTHOLOGY: Huaoranis – from the Oriente of the Ecuadorian Amazon May 23, 2017
• 99. OCEAN: Monkeyface eel (Food, Family & Fillets) April 15, 2017
• 98. GARDENING: Botanical Gardens – role, meaning and function April 9, 2017
• 97. MYTHOLOGY: Sea otter woman tale from the Yurok tribe, Northwest California March 28, 2017
• 96. MYTHOLOGY: Eagle and Coyote tale from the Yurok tribe, Northwest California March 28, 2017
• 95. GARDENING: Horticulture opportunities in San Francisco March 23, 2017
• 94. DESIGN: Drawing plants March 23, 2017
• 93. GARDENING: Nitrogen February 18, 2017
• 92. PLANTS: Bromeliads February 14, 2017
• 91. ENERGY: Fuels February 14, 2017
• 90. PLANTS: Camellias December 1, 2016
• 89: PLANT CHEMICALS: Hormones and alkaloids September 27, 2016
• 88. PLANT STRUCTURES: Roots, stems, leaves, flowers, seeds September 27, 2016
• 87. PLANT PATHOLOGY: Vectors, viruses and bacteria September 27, 2016
• 86. PLANTS: Centers of Diversity August 13, 2016
• 85. PLANTS: Basic cactus identification June 27, 2016
• 84. MYTHOLOGY: Sedna the sea goddess from the Inuit nation June 16, 2016
• 83. MYTHOLOGY: all are family and relatives inspired by the Huichols of Sierra Madre Occidental June 8, 2016
• 82. PLANTS: Piperaceae and kava May 19, 2016
• 81. LANDSCAPE DESIGN: Plant placement March 12, 2016
• 80. PLANTS: making cuttings March 4, 2016
• 79. LANDSCAPE DESIGN: Water features March 1, 2016
• 78. WATER: Fishing December 4, 2015
• 77. SOILS: Composition and function December 4, 2015
• 76. CULTURE: Old technology December 4, 2015
• 75. LANDSCAPE DESIGN: Hatching November 25, 2015
• 74. PLANTS: chemicals – cardiac glycosides, anthaquinone glycosides, and saponins November 25, 2015
• 73. GARDENING: Climate November 16, 2015
• 72. CULTURE: Natives? November 16, 2015
• 71. LANDSCAPE DESIGN: Hardscape materials September 30, 2015
• 70. PARKS: Glen Canyon, San Francisco June 30, 2015
• 69. MYTHOLOGY: Amazon metamorphosis June 30, 2015
• 68. MYTHOLOGY: Wapaq fungus from the Koryak of eastern Siberia June 30, 2015
• 67. MYTHOLOGY: Looking for Wirikuta – tales from the Huichols of Mexico June 30, 2015
• 66. GARDENING: body mechanics and injuries April 23, 2015
• 65. SURF: old time stories March 29, 2015
• 64. FUNGUS – basics March 29, 2015
• 63. PLANTS: abscisic acid, pollination and fertilization February 20, 2015
• 62. SOILS : Cation Exchange Capacity and colloids February 20, 2015
• 61. SOILS: food webs and organic matter February 17, 2015
• 60. SOIL: basics and a little chemistry January 29, 2015
• 59. PLANTS: Cartoons about grasses November 13, 2014
• 58: PLANTS – Conifers October 19, 2014
• 57. PLANTS: Children’s gardens September 5, 2014
• 56. CULTURE: Electronic devices August 15, 2014
• 55. ANIMALS: Sea turtles July 30, 2014
• 54. ANIMALS: snakes June 24, 2014
• 53: PLANTS: parts June 24, 2014
• 52. MYTHOLOGY: Coyote ceremony at the beach May 11, 2014
• 51. PLANTS: Joys of working as a gardener cartoon May 7, 2014
• 50. PLANTS: Coca and cola cartoon March 29, 2014
• 49: ANIMALS: Habitats and adaptations cartoon March 24, 2014
• 48: TREES: Death and disease March 24, 2014
• 47: Miscellaneous TREES and LANDSCAPE DESIGN: styles March 8, 2014
• 46. TREES: Pruning and planting March 3, 2014
• 45. TREES: selection February 25, 2014
• 44. OCEANS: Waves!!! February 14, 2014
• 43. SOIL, WATER and TREES: relationships February 2, 2014
• 42. TREES: Identification and classification January 31, 2014
• 41. SOILS & RAINFOREST January 25, 2014
• 40. TREES – some basic vocabulary January 22, 2014
• 39. LANDSCAPE DESIGN: site survey January 21, 2014
• 38. ART: A few old watercolors December 19, 2013
• 37: CULTURE: Race and ethnicity December 19, 2013
• 36. RAINFOREST: A patient’s perspective – Traditional Amazonian Medicine December 17, 2013
• 35. SAN FRANCISCO: Features November 7, 2013
• 34. RAINFOREST: Cuentos de la selva September 27, 2013
• 33. RAINFOREST: dibujos de bosque September 12, 2013
• 32. INVERTEBRATES: Bee love June 14, 2013
• 31. INVERTEBRATES: larvae April 15, 2013
• 30. ADVERTISEMENT: books April 9, 2013
• 29. INVERTEBRATES: rule April 9, 2013
• 28. CULTURE: Science and stories – is there a conflict? February 20, 2013
• 27. CULTURE: Quiz for fun February 7, 2013
• 26. RAINFOREST: por los abuelos January 29, 2013
• 25. MEDICINE: Healing with plants December 28, 2012
• 24. RAINFOREST: Plants as teachers? December 11, 2012
• 23. LANDSCAPE DESIGN: Notes on Chinese gardens October 4, 2012
• 22. IRRIGATION: notes September 14, 2012
• 21. PLANTS & OCEANS: chill hour and garbage September 5, 2012
• 20. VEGETABLE GARDENING: Challenges August 27, 2012
• 19. ART: Reuse in ’92 August 16, 2012
• 17. RAINFOREST: Umbilical cord of the milky way August 3, 2012
• 16. TREES: People are walking trees August 2, 2012
• 15. PLANTS: Baobab and yage July 23, 2012
• 14. FIRE: on the mountain July 18, 2012
• 13. VEGETABLE GARDENING: Kimchi and day length, hot and cold July 17, 2012
• 12. WATER, PLANTS & INVERTEBRATES: washing dishes, fixing decks, parasitic beetles July 3, 2012
• 11. PLANTS: Betel nuts and dosage July 2, 2012
• 10. PLANTS: seeds, stilt roots, latex canals and sap June 30, 2012
• 9. INVERTEBRATES: Insect pests in the garden June 28, 2012
• 8. WATER & SOILS: serpentine soils and water molecules June 27, 2012
• 7. CHINA: Plants and language in Chinese foods and medicines June 26, 2012
• 6. CHINA: Yin and Yang June 26, 2012
• 5. CHINA: mythology and language June 25, 2012
• 4. PLANTS: corn story June 24, 2012
• 3. OCEANS: Go surf! June 24, 2012
• 2. OCEANS: Shark food June 23, 2012
• 1. PLANTS: Enter the world June 19, 2012