
Physics
Scientists Say: Doppler effect
The Doppler effect is a perceived change in the frequency of light or sound waves due to the wave source moving relative to an observer.
The Doppler effect is a perceived change in the frequency of light or sound waves due to the wave source moving relative to an observer.
Scientists and engineers are trying to add touch to online shopping, virtual doctor appointments and artificial limbs.
Computers are getting smarter all the time. At some tasks, they can even outsmart people.
A new system that uses earmuffs to collect gases coming out the skin could help doctors diagnose a variety of diseases, scientists say.
More precise clocks could improve technologies such as GPS and help scientists test major ideas in science.
A new way to harvest electricity relies on a tiny array of antennas and a lens. Together, they collect and focus 5G signals coming from any direction.
The copter's 40-second-long flight in the Red Planet’s thin air is only the first in a planned series of daring flights.
A new way to transmit wireless communications promises time and energy savings by using networks of smaller cells.
By combining patterns found in mountains of data with information gleaned from mistakes, these computer programs expand their artificial intelligence.
New technologies aim to listen to — and maybe even change — your brain activity. But just because scientists can do this, should they?