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.
In 1796, Edward Jenner, a country doctor in southwestern England administered the first vaccination against smallpox. Common lore held that people who had been exposed to cowpox were immune to smallpox. Based on this observation, Jenner conducted an experiment to test the use of cowpox as a vaccine against smallpox.