Find out information about kaleidoscope. optical instrument that uses mirrors to produce changing symmetrical patterns. Invented by the Scottish physicist Sir David Brewster Brewster, Sir David,... Explanation of kaleidoscope
While books remains the most popular category for Amazon, it is quickly growing its other categories and diversifying into new areas. Here's the top 10 things people bought in February of 2015, ranked according to the number of purchasers in each category. 10. Cosmetics and fragrances.
The Echo is one of Amazon's top-selling gadgets, a frequent sellout, and 2015's most impressive piece of technology, per CNET's own Dan Ackerman. Alexa doesn't show any signs of slowing down in 2016, either.