We might mention : many other important inventions which are now conferring ... operations by examining the columns of the j Scientific American. What we hope from ! community is not to forget ...

This Women's History Month, we're celebrating inventions made by women. Nancy Johnson created the first hand-cranked ice-cream maker in 1843. Famous American chef Julia Child developed a shark ...

He succeeded every now and again with an invention that would change the world ... The library keeps archives of many of America’s copyrights and blueprints, so National Geographic asked ...

These two inventions have helped create a world where ... constant spread of information is essential as we explore the most important innovations of the last 30 years.

hands-on invention educational activities, art collaborations, and the acquisition of skate objects for the national collections of the Smithsonian. National Museum of American History Powell ...

This is called the "Calendar Round" and the number became important in Central American cultures. The 260-day calendar, called a tzolkin, consists of two wheels, a larger one of twenty days and a ...