This video explains the periodic table, containing all the known elements arranged in groups and periods. Elements in the same group of the periodic table show trends in physical properties ...

How do we calculate mass and atomic numbers? VideoHow do we calculate mass and atomic numbers? This video is an interactive lesson in calculating an atom's mass and atomic number.

Table tennis is derived from lawn tennis and was initially played as after-dinner entertainment among upper-class English families who would use whatever they could find as equipment. At the time, ...

My sister, my mom, and I entered the foyer of his brother’s full house, the usual smells wafting: turkey, gravy, onions, ...

The U.S. and China are in a high-stakes race, with the energy security of America and its allies hanging in the balance. It ...

A bedside table is more than just somewhere to put a book and your morning cuppa. It's a place where you keep things so essential that you want them close even when you're asleep. Our collection of ...

Director James Gunn is poised to introduce a ton of characters in "Superman." Here, we break down every DC hero and villain ...

The HP LaserJet M209d is a sterling value among low-cost, print-only mono laser printers. (If you're considering an inkjet but print only occasionally, it's a tempting alternative.) Its paper ...

Chondritic meteorites (chondrites) are some of the oldest rocks in our solar system, forming 4.5 billion years ago. Therefore, their primitive composition means that they offer a window into the ...

India's robust election management system, from Himalayan hamlets to the Sundarbans, is a model for the world. Its scale, ...

The links below take you to web pages where you can access PDF files of annual tide-tables. These can be printed for personal use or used in publications, subject to the conditions as stated on these ...

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