What is the best online tool to learn maths that isn't fucking Khan Academy?

I also have a $100 gift card to half price books and can buy whatever book, basically.

"A study has shown that X occurs from 3 to 75 percent." What reason would allow you to write such a thing?

Guys, can anyone help me with this? you have P and v. P is 14π dm, and v is 6dm. You need to get r out of this. Is it even possible?

So you have a tensile stress being applied to a thin sheet containing a circular hole.

You're told to drill two stress relieving holes just touching the original one.

Where do you put them and why? How big will be the stress reduction if drilled correctly?

What are the chances we cure MPB by 2030

Hey,

How do i get better at counting. I have a huge problem woth numbers, they seem sp abstract, when the number gets bigger then 10 i have to use my fingers. I just cant imagine numbers in my head. What is my problem, apart from being stupid. is there a way to train this?

https://www.youtube.com/watch?v=7o4_AgUu5S0

>Researchers have identified a new genus and species of small ape that roamed Earth 11.6 million years ago before the evolutionary split of humans/great apes (hominids) and gibbons.
>Named Pliobates cataloniae, the new species has important implications for reconstructing the last common ancestor of the two groups (the living hominoids).
>Anthropologists previously thought that great apes were present before small apes, mainly due to the lack of small apes and ancient gibbons in the fossil record.
>The discovery fills a gap in the fossil record, giving researchers another piece of information about the evolution of great and small apes.

http://www.sciencemag.org/content/350/6260/aab2625

What is the most SCIENCE song you know?

Trite lovesongs dominate pop, but do you know any songs that have lyrics about the awe of science or math? Or anything that mentions science at all?

Starting...
>Melodysheep
https://www.youtube.com/watch?v=XGK84Poeynk
Obv, Carl Sagan and Feynman autotuned straight from documentaries, it doesn't get any more popsci than this

>Fanfarlo - Let's go extinct
www.youtube.com/watch?v=CkWGoqiqdAc
An album loosely about evolution and the human future, ambitious but nicely pulled off. Their other albums have little to do with science though.

Can anyone tell me the origin of the word cratic as used in solvation chemistry?

I've got advanced knowledge of cryptography in the abstract, studied lots of this during my PhD in math. I know a little bit of coding too.

How do I actually apply this though? I know all kinds of attacks against various crypto systems, but when I sit down in my computer, what do I actually do? Where does cyphertext come from in practical situations? Is there somewhere to practice?