Activity trackers can provide a good overall estimate of calories burned, but an Iowa State University study finds they're less accurate when measuring certain activities, such as strength training.
Since 2010, the best estimate of the age of Earth's magnetic field has been 3.45 billion years. But now a researcher responsible for that finding has new data showing the magnetic field is far older.
When political candidates give a speech or debate an opponent, it's not just what they say that matters—it's also how they say it.
Until recently, there were very little experimental data about the behavior of beryllium (Be) at very high pressures and strain rates, with existing material models predicting very different behaviors in these regimes. In ...