A deal with Hewlett-Packard will place Yahoo search and other services on H.P. personal computers sold in the U.S. and Europe.

In “Life: A Journey Through Time,” renowned nature photographer Frans Lanting evokes the history of life on Earth in a breathtaking multimedia display featuring the spellbinding music of Philip Glass.

Trend Micro is researching how PCs, including many computers in defense agencies, are infected with software that can be used to mine confidential data, send spam, or launch denial-of-service attacks. But government IT managers challenge those findings, a...