numerous things, time travel for example
A cure to HIV
something that hasn't been invented yet is a teleportation device Manned Interstellar Travel
it hasnt been found but i know you can reasearch about why it wasnt found
putangina
Probably the pulley amongst the simple machines is having the greatest impact on mankind.
something he accomplished
it could mean that your dog has been fed something or has eaten something that hasnt agreed with its stomach or he might be sick or have an allergy to something.
Boastful means to talk proudly about something you have, or something you accomplished.
he acomplished something
The word accomplished means to achieve something successfully. The following is a sentence with accomplished in it, "She has accomplished a lot of success through her career".
To be the talk of something means everyone is talking about you and something that you have accomplished.
Something important
she died!
Freed slaves
the mom because not(hasnt) not(double negative has) not(hasnt) person that has not (has [double negative]) not (hasnt) set foot on the moon
An erupting volcano is something that mankind has to admit is unquenchable by human efforts.
Something accomplished, especially by superior ability.