The very first invention is the light bulb. 
In order to have the light come out you needed power going into it. This is also a battle that people fought about. The man that made the first light bulb was Tomas Edison The Date:1881.
The next invention was Antibiotics. This can help with most bacteria in the body. There has been problems in world war 1 with the bacteria. Date:1928
Antibiotics isn't the only thing that can help mankind. There is Penicillin. Alexander Fleming was the first person to investigate Penicillin's bacteria-busting effects.Date: Unknown
Smallpox was once a common disease killing most victims. Now Vaccination can solve that problem.
It prevents more than 2 million deaths every year. Date:1796
Microscope's can be very cool when you look in side of it. You can see all of the microscopic things. 
Date:1590
Xrays can be very useful when looking inside a person or animal. Date:1895
DNA is our key to life.The DNA we all cary can come from any part of you. Cheek skin, hair, spit, body part or other things that live on earth. Like Plants! DNA is so cool that you could see it in a microscope. Hay we jest talked about that.
Date:1953
Radioactivity is a very dangeres thing. IT CAN BLOW Any TIME! Date:1896
