Recent content by Loowee

I agree, Choppy. Nicely done. I would like to add, though, that there are labs that post in their X-ray rooms how often people can have a chest X-ray in a year, and one at least advertises that a person can have as many as 166 in a year. I presume that it is also a "simplified" approach to...

As Choppy mentioined above, a chest X-ray typically delivers a dose of 0.1 mSv. Non-radiation workers are allowed an exposure of 20 mSv/year; radiation workers 50 mSv. Deduct the 2-3 mSv/year that we get from the environment. That leaves us with 17-18 mSv/year of allowable exposure. From a...

Here in the Philippines, the K-12 curriculum was launched nationally only last month (June 2016). In the current curriculum, kindergarten students are introduced to statistics and probability concepts. The topics build up slowly from grade to grade culminating in combinatorics in grade 10...

Try www.ck12.org. The site has free PDF books from arithmetic to calculus. Free signup using your email address. You can only download if you're a member. Good luck.

You may want to try Basic Physics by Karl F. Kuhn. It's "real" physics with easy math. Try downloading free books from www.ck12.org. The site has free conceptual and "real" books. You have to sign in as a member (free signup using your email address). National Council of Educational...