Welcome to Science Lesson Resources for Teachers and Parents!

 Let's find out how to measure the distance from Earth to any star. >>>>>>>>>  Parsec Parallax  <<<<<<<<<<<<<<<<< But first you shall know how to measure angles. 1. Read this: 90°11`41`` This is 90 degrees, 11 arcminutes, and 41 arcseconds 2. Is this correct? Why? 51°20`90``  No. Arcseconds and arcminutes cannot be greater than 60! 90`` -> 1`30`` 51°20`90`` -> 51°21`30`` Arc minutes and arc seconds are just like minutes and seconds on the clock!

 Fundamental knowledge means that you've learned a subject in a classical way, in the right order, with no gaps. For example , if you learn fundamentally about organic chemistry, you 1. learn the topics in the classical sequence:  alkanes, alkenes, alkynes; and then add functional groups: alcohols, aldehydes, ketones, acids, ethers, esters, amines, amides, proteins, and sugars. 2. understand the main concepts: nucleophile, electrophile, dative bond, Lewis structure, VSEPR Valence shell electron pair repulsion, etc. With fundamental knowledge you have a good foundation to build on, and you can understand specialists, have a common language with the scientists. Here are a few of excellent channels to explore and build Your knowledge fundamentally on each topic: 1 - Organic chemistry - 30 videos sequence, free Organic Chemistry Exam 1 Review - YouTube 2 - General Chemistry - all the elements in the periodic table by groups: Periodic Table Part 2: Alkali Metals (Li, Na, ...