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Inhaling cigarette smoke or smoggy air is clearly not great for your health. And exposure to various kinds of smoke has been associated with cardiovascular disease, rheumatoid arthritis and cataracts

The lush riverside vegetation sways as a herd of elephant wends its way between the broken pools. Standing at the top of an embankment, a half-grown male is watching a larger elephant trudge up the slope toward it. Without warning, the youngster squats down on his haunches (just like a dog) and launches himself down the slope.

Editor's Note: This post was intially published May 12 on the World Science Festival's Web site .

1. Apple and Google will be called back to testify before the Senate hearing on digital privacy on Thursday, but this time they'll also be joined by Bret Taylor, the CTO for Facebook

The Winklevoss brothers are at it again.

The inaugural post of Eileen P. Gunn's new Inc.com blog, Start Me Up. Being an entrepreneur energizes me.

Key concepts Sun and moon [More]

For feathered dinosaurs the late Cretaceous period may have been a very itchy time. Lice--the tiny wingless insects that feed on dead skin, and sometimes blood--were just beginning to dig in about 100 million years ago, and the epoch's small furry mammals, early birds and dino-birds would have provided ample food. The louse fossil record is relatively sparse

Bombs away! Scientific American Editor George Musser and his daughter Eliana simulate a meteor shower using nuts, cake mix and common kitchen items.

By Nicola Jones of Nature magazine The past five years has seen a spurt in the creation of giant marine protection areas, including a 320,000 square-kilometer marine reserve announced earlier this month in Australia. "Now we have a competition for politicians to see who can have the biggest one," said Daniel Pauly of the University of British Columbia in Vancouver, Canada, at the start of the Society for Conservation Biology's 2nd International Marine Conservation Congress in Victoria, Canada, on Saturday. [More]

By Quirin Schiermeier of Nature magazine After months of soul-searching, the Intergovernmental Panel on Climate Change (IPCC) has agreed on reforms intended to restore confidence in its integrity and its assessments of climate science. Created as a United Nations body in 1988 to analyze the latest knowledge about Earth's changing climate, it has worked with thousands of scientists and shared the Nobel Peace Prize in 2007. [More]

Take a look at this map of the U.S. at night.

When someone divides a complex phenomenon into two basic categories, he invariably oversimplifies and distorts reality.

If you want to guess how many jelly beans are in a jar, you should ask your friends.

Titan, Saturn's largest moon, has numerous lakes and seas. But they're not bodies of water--Titan's reservoirs are full of liquid hydrocarbons such as methane.