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Israeli Soldiers Sweep Into Gaza
IDF tanks and infantry launch a ground offensive in the Palestinian enclave
(Uriel Sinai / Getty)
The Science of Snowflakes
Caltech physics professor Kenneth G. Libbrecht has turned his passion for the study of ice crystals into an art form. In his books and website, Snowcrystals.com, he breaks down some of the basics behind these miniature miracles of nature
(Kenneth G. Libbrecht)