WASHINGTON _ Despite recent efforts to remove or rename Confederate memorials, there are still more than 2,000 symbols in places across the country, according to a report released Thursday.

Save guides, add subjects and pick up where you left off with your BBC account. Get hands-on with KS3 science investigations in Atomic Labs. Experiment and put your science skills to the test ...

bi-colour and tri-colour LEDs (Light Emitting Diodes) – red, yellow or green indicator lights colour is often used for community safety information (red - danger, amber - stop, blue - caution, green – ...

Save guides, add subjects and pick up where you left off with your BBC account. Sound waves are vibrations that are passed on between particles. The speed of sound is the distance a sound travels ...