How have kettles changed over time?

What is the Correct unit of measure of 1000m? A sentence for the word independent variable? Which researchers have theories on love? What is the phenomenon called when the similarity of the characteristics of sheep and reindeer is due to their having a common ancestor? Can you fit 2 pints into 1 pint glass? What is 160 Fahrenheit equal to in Centigrade? When washing your hands you should use and hot water to kill germs? What are some of the places that one can learn more information about residential solar energy? What does scoob mean? What is a good insulater? How do unbalanced forces affect an object's speed? What is insoluble solid? Is calcium melleable? Who is the first scientist to use the term cell to refer to the building blocks of life? Explain why the electrical charge on an atom is zero or neutral? How many miles is 119k kms? What is a food that the body turns into sugar? What are the types of secondary colours? Who are the two scientists who helped Darwin recognize how old the Earth is? What are the three major steps of the scientific method?