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Mercury is the closest planet to the sun, and it's the smallest in the solar system. So why does it have longer days than we have on Earth?

Neptune is the eighth planet from the sun and one of the coldest. Its supersonic winds are also the fastest in the solar system.

Smart bombs use sensors and flight systems to find a specific target. Learn how smart bombs work and about smar-bomb technology such as the JDAM.

The floating planet theory states that a planet that is light enough should be able to float on water. Learn about the floating planet theory.

Heating systems keep our homes warm during the winter, and air conditioning keeps us cool in summer. But do you know how HVAC systems work?

Does the four-seater Ferrari FF measure up to the performance of other Ferraris? Read details and specs for the Ferrari FF at HowStuffWorks.

Oil-free face lotions are ideal for people with acne. Visit HowStuffWorks to learn all about oil-free face lotions.

Getting rid of acne scars can be tricky. Learn how to get rid of acne scars at HowStuffWorks.

Sunscreens for athletes should be sweat-proof. Visit HowStuffWorks to see the top 5 sunscreens for athletes.

There are safe ways to invest family savings. In this article, learn about 5 safe ways to invest family savings by HowStuffWorks.com.

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