Notebook

Humans

From the November 21, 1936, issue

Wild turkeys, a life-extending diet, and seeing through fog.

Physics

Snow Crystals

This Web site, created by Caltech physicist Kenneth G. Libbrecht, is all about snow crystals and snowflakes. With many beautiful images, it provides a guide to snowflakes, information on growing snowflakes, an introduction to the physics of snowflake formation, and ideas for snow and ice activities. Go to: http://www.snowcrystals.com/

Health & Medicine

Bone Health

The Web site of the International Osteoporosis Foundation offers information for health professionals and the public about osteoporosis, a disease that reduces the density and quality of a person’s bones.