Subcategories include very low birth weight (VLBW), which is less than 1500 g (3 pounds 5 ounces), and extremely low birth weight (ELBW), which is less than 1000 g (2 pounds 3 ounces). Normal weight at term delivery is 2500â4200 g (5 pounds 8 ounces â 9 pounds 4 ounces).
How do you define beauty? What are the factors that govern whether or not you find someone physically attractive? This question has plagued philosophers and artists for millennia. And now, modern scientists think they're close to finding that magical formula for physical beauty. Aside from the obvious cues,--youthfulness, smooth skin, bright eyes--it pretty much all comes down to math.
The tool scientists use to test their theories is called the scientific method. Whether you are studying stars, caterpillars or medicines, this method remains the same. If you have an idea, or a question, you have to be able to prove it and give evidence so that other scientists can check and test your results. Here we are going to show you the best way to design and conduct science experiments.