Andrew Bridges' Articles
- Radar, sonar and lidar and are three similar technologies. Each relies on the echoing of waves — radio, sound or light waves — to detect objects.
When it came to getting into the White House Science Fair, Holly Jackson had it all sewed up. Nikhil Behari, too, had just the right touch.
- The Intel Science Talent Search is America’s top high school science competition. This year, the top finishers took home more than $1 million in prizes.
- More than half of all teens 15 and older get less than seven hours of sleep, according to a new study. That is two to three hours less than recommended. Overall, teens are sleeping less with each passing year, data show.
- Reading on an iPad in the evening can make it harder to fall asleep — and harder to wake up the next morning, a new study finds. The light from its screen tinkers with the body’s clock. And that could risk harming your health.
- The United States is experiencing an outbreak of measles. A traveler likely brought in the virus from abroad, which is now spreading. Most of those infected were never vaccinated and could now face serious health risks.
- Many people think that the measles vaccine wiped out the disease — at least in the United States. It hasn’t. And people who were never vaccinated face the primary risk of getting this very serious disease
A tornado is a violently rotating column of air extending from the ground to a thunderstorm above. Tornadoes can leave a path of damage more than 1.6 kilometers (1 mile) wide. They can travel more than 160 kilometers (100 miles) over land. And while some touch down briefly, others can last for more than an hour.
Tornadoes start with a thunderstorm. But they also require other ingredients, such as instability. Air is unstable when it is warmer closer to the ground than it is higher up. That warm air will rise, just as a hot-air balloon does.
"Tornadoes devastate South, killing at least 251”
What could be more forceful than this real news headline?
The tornadoes that inspired it.
- Tricking kids into wanting to learn is a trait of a good teacher.