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The nucleus of an atom is the dense central region that contains most of the atom's mass and positive charge. It is made up of two types of particles: protons, which have a positive charge, and neutrons, which are neutral and have no charge. The number of protons in the nucleus determines what element the atom is, and the combined number of protons and neutrons is called the atomic mass.

Alexander Graham Bell invented the telephone in 1876. He was awarded the first U.S. patent for the invention of the telephone the same year.

The Commodore PET (Personal Electronic Transactor) was the first commercially successful personal computer, released in 1977. It featured a built-in keyboard, a small screen, and a cassette tape drive for data storage.

Titan arum, also known as the "Corpse Flower", is a large flowering plant native to Sumatra, Indonesia. Its foul smell, which is similar to that of rotting flesh, helps attract carrion beetles and other pollinators.

The skin is the largest organ in the human body, and it serves several important functions, including protection from the environment, temperature regulation, and sensation.