Read this excerpt from "Heads Up on Sports Safety.” The dangers to your head depend on the sport, but some general principles guide helmet design. First, the helmet needs to be as cool and lightweight and comfortable as possible. Second, the helmet needs to be hard enough and fit well enough to protect the skull and brain. For some athletes, like hockey goalies or baseball catchers, the helmet also needs to protect the face from fast pucks or balls. Third, it must not prevent the wearer from seeing or hearing. Fourth, it cannot cause more injuries than it prevents.

It turns out that the way to address many of these concerns is to use hard but flexible, light, strong materials on the outside and soft materials on the inside. Scientists create new plastics all the time, but sometimes the best designs come from using old materials in new ways. One recent design makes the shell of helmets out of Kevlar, the same kind of light plastic used in bulletproof vests.

Which is a key detail that supports the main idea that there are general principles that guide sports helmet design?

samuel gompers was an extremely important person in the american labor movement, being him an employee all his life he devoted himself to fight for the rights of his pairs, he believed they all had the right to have better thing and that they all were working for them but the factory workers were greedy, ambitions and socialist people for him who he didn't have a good concept of.

he gave so many speeches and led so many strikes and protest to fight for equality which he considered employers didn't want to accept, so he had an absolutely negative opinion of them.

martians or other types of aliens represent a unique fear as opposed to zombies. vampires and other types of monsters.   in most sci-fi stories, aliens come from other worlds and have different or more advanced technology.   abductions and experimentation on human bodies that involve these technologies, or the use of these technologies against human beings and the use of unknown "powers", are a type of fear that's different from that of other types of monsters.  

the correct answer for odyssey ware is a give me brainliest

they both lost a woman they loved named lenore

they believed they interracted with a talking raven

they became orphaned at a young age.