When did you first start using an abacus?

You probably used it when you were in school or college.But if you didn't, you probably still use it for some work today.Now, the word 'abacus' has become synonymous with all kinds of things that you don't normally associate with an object.But, it was actually invented in 1723 by Johann Georg Bernoulli, a French chemist.Bernoulli made the first modern abacus in 1730, and by 1750, it had become a...

Obama’s Wall Calendar Gets 4 Imprint Wall Cams

4imprints wall calendars are a new type of wall calendar that can be printed on your own computer, or purchased from a store like Staples.Each calendar is approximately 1.2 inches tall, and the calendars are about 0.7 inches wide.4im prints the walls using digital ink and then places them on an 8.5-inch x 8.25-inch sheet of paper, which the software then computes a time and date based on the...