Complete Definition and 404 Threads

I am really new to this site and I'm only 15 so if this sounds unclear please forgive: When light hits water it diffracts so i want to ask would it be possible to make something invisible between this medium of when the light hits the water and defracts.

If we can find a formula to determine the state of a system in a future moment then we have the informations about that system before light could travel to us...got it ? So...isn't this in contradiction with relativity ? Or something like time travel ? (in the future)

The Complete Idiot's Guide to Calculus INTRODUCTION I've never really been very good at math and when I found out I had to take a Calculus class I started to panic. Once I gathered myself I went to the local bookstore to see if I could get a book to read so i could get a heads start. We are...

Hi there, thanks for coming to the thread about the single most widely abused word in all of internet discussion forumdom: logic. A few months back, I decided to pick up a textbook on the subject and work through it cover to cover. I’m about halfway done, but I thought I’d present the notes...