your love of the Walden Effect with our petroglyph t-shirt.
$10 (free shipping.)
Specify your size with your order - M, L, XL, and XXL.
all about it...
just make a donation. Every donation
means less time we have to spend marketing our products, which means
more time putting together lunchtime series and experiments for your
entertainment and edification. You choose the size of your gift.
An even better way to support us
without spending a cent is to leave a review on one of our
Amazon ebooks or tell a chicken-keeping friend about our waterers!