Pyramids were built in Ancient Egypt as tombs, or burial places, for Egyptian pharaohs, or kings. They believed that the pyramids made you immortal.
1 kilogram = 1,000 grams. A dictionary has a mass of about one kilogram. Kilograms are great for measuring things that can be lifted by people (sometimes very strong people are needed of course!). Kilograms are often written as kg (that is a k for kilo and a g for gram), so 10 kg means 10 kilograms. Scales measure our weight using kilograms. An adult weighs about 70 kg.
1 Pound = 453.59237 Grams. 1 Troy Pound = 373.2417216 Grams. There are 453.59237 grams in a pound because, by definition 1 kilogram is 2.20462 pounds (lbs) and if you divide the number of grams in a kilogram (1000 grams) by the number of pounds (2.20462 lbs), that makes 1000 g / 2.20462 (lbs in 1 kg) = 453.59237 grams in a pound.