Many years ago, there was a famous case of a boy born with severe combined immune deficiency (SCID). His physicians placed him in a pathogen-free chamber that resembled a giant glass bubble. What purpose was served by doing this? What treatments are available today that might have helped this boy?

so easy. just google the electromagnetic waves and it’ll pop up.

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me