WHY DO DOOR KNOBS FEEL COLD?

door knob

By touching a door knob or a metal object, heat is transferred from one’s hand into the metal object. However, it is not the heat transfer that makes metals feel cold, otherwise wood would feel just as cold.

THE PHYSICS OF CARBON DATING

carbon

Radioactive carbon used in radiocarbon dating is carbon that is radioactive. Since it is active, it is unstable, and therefore tends toward stability. This is common in nature; for example, if you hold an object at a certain height, it has the potential to fall, the potential energy that is.

MEUCCI INVENTED THE TELEPHONE, NOT BELL

Antonio Meucci

Antonio Meucci is the true inventor of the telephone, not Alexander Graham Bell. This century-long controversy had finally been settled by the Congress in 2002. The acknowledgement was the result of the House of Representatives’ vote of the resolution H.RES.269.