We like mechanical calculators like slide rules, but we have to admit that we had not heard of the Ott Derivimeter that [Chris Staecker] shows us in a recent video. As the name implies, the derivim… ...

Provides a review of pre-calculus, algebra and trigonometry integrated with the second half of Calculus I. Inverse trig functions and their derivative, logarithmic functions and their derivative, ...

LN Markets, a crypto derivatives exchange built on top of Bitcoin’s Lightning Network, has raised an undisclosed sum of money in a pre-seed round.