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What's the temperature? [© Shutterstock, 2010]

Science and Engineering » Physical Sciences

Who invented the thermometer?

More than one thermometer inventor tackled the task.

Use caution! [© Shutterstock, 2010]

Science and Engineering » Physical Sciences

When was spontaneous combustion first recognized?

Learn about spontaneous combustion and the chemistry of oxidation.

Gold! [© Shutterstock, 2010]

Science and Engineering » Physical Sciences

What is 24 karat gold?

Find out about gold, what 24 karat gold is, and learn what the term karat actually means.

Voltage measures force. [© Shutterstock Images, 2010]

Science and Engineering » Physical Sciences

How did the electrical term volt originate?

Find out what the volt measures in physics, and where it got its name.

Aircraft capable of flying faster than the speed of sound can make sounds. (©Shutterstock, 2010)

Science and Engineering » Physical Sciences

Why does a double sonic boom occur when a space shuttle enters the atmosphere?

Learn why a double sonic boom occurs as an aircraft enters the atmosphere.

Palladium, iridium and rhodium are among the platinum group. [©Jupiter Images, 2010]

Science and Engineering » Physical Sciences

What are the noble metals?

Learn what the noble metals are and why they're unique.

Lodestone was used by early mariners in navigation. [©Jupiter Images, 2010]

Science and Engineering » Physical Sciences

Is lodestone a magnet?

Find out if lodestone is a magnet and learn what it was once used for.

Ambergris protects sperm whales from the sharp bones of the cuttlefish they eat. [©Jupiter Images, 2010]

Science and Engineering » Physical Sciences

What is ambergris?

Find out what ambergris is and how it's used commercially.

Roman concrete consisted of lime putty and volcanic ash. [©Jupiter Images, 2010]

Science and Engineering » Physical Sciences

When was cement first used?

Find out when cement was first used and by whom.

Uranium-235 can undergo fission under neutron bombardment. [©Jupiter Images, 2010]

Science and Engineering » Physical Sciences

Which countries have uranium deposits?

Find out which countries have uranium deposits.

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