1 Calories Burned For Walking: 4.6 km/h (13 minutes per km). 2  Calories Burned For Walking: 4 km/h (15 minutes per km). 3  Calories Burned For Walking: 3.15 km/h (19 minutes per km).
The first true hypodermic syringe was created by Alexander Wood in 1853. He modified a regular syringe, which at that time was used for treating birthmarks, by adding a needle. He then used this new device for introducing morphine into the skin of patients who suffered from sleeping disorders.
It was the first time in the history of the compass that the device was mentioned as a tool for navigation. Later in the 8th Century A.D, magnetic needles replaced the loadstones. From the 8th century to 1050's, compass were actively used in ships.