I really like Opera (Windows | Mac) widgets. They all offer something unique. But I especially like the browser's science and math widgets.
If you're someone who just can't get enough of planets, you love building mathematical graphs, or you enjoy science, these widgets are for you.
Astronomy Picture of the Day Each day, when you load Astronomy Picture of the Day, it displays a picture it gets from NASA. When you click on that image, it gives you an in-depth description of what's being depicted and why it's important. I found it to be extremely informative. Practically anyone who likes astronomy should be pleased with Astronomy Picture of the Day.
Chinese Abacus If you want to get some addition, subtraction, multiplication, or division work done, look no further than than the Chinese Abacus widget. Much like the real thing, you can move the blocks up and down to keep count. The abacus will show a tally at the bottom to help you.
Before you start using it, beware that the Chinese Abacus widget requires some knowledge of the abacus to get it to work. Once you get the hang of it, you'll find that it makes performing basic math functions quite simple.
Functions 3D Functions 3D isn't for the novice mathematician. The widget lets you create a 3D structure based on a mathematical equation that you devise.
Once you set the X, Y, and Z boundaries, you'll create an equation to develop the figure you want to depict. You can create simple archways or complex statues by changing the equation to fit your needs. Functions 3D is one of the more powerful Opera widgets I've ever used. It's also one of the most difficult to understand.… Read more