Natural sciences

Natural sciences is the skill that combines use of chemistry, physics and for the most part even biology. Be it a discussion about what orbits what, sun the earth or earth the sun, or testing the drinking water you took out of the well on radiation and agreeability.
Bonuses would be applicable – to stay with the examples – for a book that explains the solar system or some good lab equipment. Handicaps if your own education covers more chemistry than other things and you have no idea how to explain the Copernican system.

The starting value is: 20 + 2 * I