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Why do astronauts appear weightless despite being near the Earth?

How to solve for the horizontal displacement when the projectile starts with a horizontal initial velocity. We also explain common mistakes people make when doing horizontally launched projectile problems.

This YouTube video explains how to calculate an irregular area on a map.

This video explains how to calculate the perimeter of various 2D shapes.

This YouTube video explains how to calculate a regular area on a map.

Video 1: How to construct a copy of an angle
Video 2:
Video 3: Common mistakes made when constructing an angle as a copy of another

Video 1: How to construct angles of a given measurement using paper and a protractor 
Video 2: How to construct angles of a given measurement using a compass
Video 3: Examples of constructing angles of specific measurements
Video 4: Common mistakes made when constructing angles of specific measurements

This online article delves into our the sun and planets were formed.

From the extinction of the dinosaurs to humanity.

Overview of fertilisation and early human development. From conception leading to a zygote to blastocyst, embryo and fetus.