Who invented glow in the dark numbers for watches?

Answer The original glow in the dark watches got their glow from radium, a radioactive element mixed with zinc sulfide that glows when exposed to radiation. William J. Hammer invented this paint in 1902 a... Read More »

Top Q&A For: Who invented glow in the dark numbers for watches

Are the numbers on the back of the Social Security card the routing numbers for the Federal Reserve?

Newer cards issued by the Social Security Administration have a red number printed on the back. Rumors state that these numbers signify a routing or account number within the Federal Reserve bankin... Read More »

Telephone numbers that start 0845 are they free numbers?

No, they are charged at up to 5p/minute from a landline phone, and more from mobiles. Although originally planned to be "local rate" you will find that they aren't normally included in any inclusi... Read More »

How do I Stop a Browser from Displaying Skype Numbers Instead of Normal Phone Numbers?

Skype is an instant messenger service that also allows you to make phone calls and video calls. When you install Skype, it comes bundled with the Skype browser add-in. One of the features is that i... Read More »

What kind of numbers did arabic numbers replace?

The Roman numeral system of numbers spread as the Roman Empire grew. The Roman number system began around 3 B. C., but the older Arabic number system with decimals and a zero replaced it.Source:Hi... Read More »