Art conservators can use X-rays and infrared technology to learn more about the structure of a painting, the paint layers and what happened to a painting over time.
From the science, researchers know a lot about how reading works, how children learn, the kinds of obstacles children encounter, and where teachers and classroom activities can make a difference.
Fireworks, as you can tell from the name, involve fire. To get a fire you need fuel, oxygen and heat, and that’s true in fireworks also.
Friction is a force that resists sliding motion between contacting surfaces. A bike, for example, has many instances of friction.
The rule to remember for curveballs: whichever way the front face of the ball is spinning will be the direction in which it curves. The effect is more dramatic with ping pong balls and tennis balls because of their lower mass compared to baseballs.