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.
Later on, magnetized needles were used as direction pointers instead of the spoon-shaped lodestones. These appeared in the 8th century AD -- again in China -- and between 850 and 1050. They seemed to have become common as navigational devices used on ships. Compass as a Navigational Aid