From Yourself and Your Body by Sir Wilfred Grenfell, 1924.

From Wonders of the Human Body by Anthony Ravielli, 1954.

Illustration by Lynne Cherry. From If I Were in Charge of the World and Other Worries by Judith Viorst, 1982.

Source unknown.

Source unknown.

Lightning

From String Figures and How to Make Them: A Study of Cat's Cradle in Many Lands, 1962