To sum up...
http://www.opentopia.com/calculators.html
Whether you are struggling with a mathematics problem online, or trying to do one offline, this website is a must-bookmark. You will find a wide variety of useful mathematical tools ranging from scientific calculators to unit converters. So if you are stuck with long-winded calculations, just log on to this website and life will seem much simpler.
Animated biology
http://www.johnkyrk.com/
The chapter on cells is always the first one to be taught in biology. This means that if you do not understand the concepts properly, it will become increasingly difficult to understand the rest of the chapters. This website, with its animated videos, will explain to you the different characteristics of cells, their different parts and the entire concept of DNA.
Fun with science
http://www.hunkinsexperiments.com/
This website features a lot of experiments divided into categories like food, light and clothes. Each category houses related experiments that are easy to conduct. For instance, in the food category you can find out how to cook potatoes in the Sun, how to grow carrot leaves and how to chop a doughnut in thirteen pieces in just three cuts of the knife.
Picture this
http://www.chemsoc.org/viselements/pages/pertable_fla.htm
Who says the Periodic Table is boring? Check out this pictorial one: in order to read information, you will have to hover your mouse over the picture, and symbols and other routine information regarding the elements will be displayed, while clicking on the picture will give you more details. Chemistry is just a click away!
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