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Recent Thinkwalks articles…Show all

Leaping Frog Fungus!

January 5th, 2015

I just learned more about why the project to get rid of the preggie test frogs has been failing. Which frogs? The African clawed frogs that live in Golden Gate Park in the Lily Pond. Apparently they were dumped there as a gesture of goodwill.

Back in the 50s rabbits were all the rage for pregnancy tests. A pregnant woman’s urine would cause the rabbit to ovulate. Problem was that you had to kill the rabbit to find the result. Then bufo marine toads and African clawed frogs were found to [...]

Atmospheric River Meditation in SF

December 13th, 2014

Here’s my 7-minute storm video, meditative and exploratory rather than my usual strict documentation.

San Francisco was blasted by a few inches of rain in a single day on Thursday, Dec. 11, 2014. It was an ‘atmospheric river’ (AR) like a fire hose of water vapor flowing about a mile up in the air off the sea from the equatorial region beyond Hawai’i.

First it blasted Canada and then Washington, then Oregon, then us (in essEFF), then Southern California.

I’ve been researching the probable AR storm sequence of 1861 & 1862, as readers [...]

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  • Do you know what natural waterways course beneath your feet? Find out on a Water Walking tour!

  • How are Laguna Honda and Stow Lake related? Find out on a Watersheds of Laguna Honda tour!

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  • From 7th Ave. to the Pacific was once windswept open dunes; find out how and why it was transformed on a Golden Gate Park Outside Lands tour.