321. The sun is moving around the center of the galaxy at a velocity of approximately 220 km/s.
322. The rusting of iron involves oxidation.
323. Water vapor beyond the dew point results in condensation.
324. The approximate age of the Milky Way is 13.5 billion years.
325. Galaxies are collections of stars, gas, dust, and dark matter that are held together by gravity.
326. Vitamin B6 is not a fat-soluble vitamin.
327. It takes about 27.3 days for the moon to orbit the Earth once.
328. Scientist Neil Theise discovered a previously undetected feature of the human anatomy called the interstitium.
329. The Montreal Protocol of 1987 was a treaty to protect the ozone layer.
330. White blood cells are also known as Leucocytes.
331. Fleas spread Typhus.
332. The average weight of the human brain is approximately 1.2 to 1.4 kilograms.
333. The average weight of the human heart is around 300 grams.
334. The Father of Botany is Theophrastus.
335. Oncology is the study of Cancer.
336. The psychological test using inkblots is formally known as the Rorschach test.
337. The outermost layer of the Earth is called the Crust.
338. The symbol of Gold is Au.
339. In an oil lamp, the oil rises up in the wick due to capillary action.
340. Gas bills are charged using the BTU (British Thermal Unit) system.