2 inventions discovered by Egyptians by making pyramids?

 In order to tell the time Egyptians invented two types of clock. Obelisks were used as sun clocks by noting how its shadow moved around its surface throughout the day.

Explanation: Cause I know

Lime mortar - Lime mortar was invented by Ancient Egyptians before the Old Kingdom and was used in the construction of the Great Pyramid of Giza. Egyptian Alabaster - Alabaster (Egyptian alabaster) was discovered and used abundantly in ancient times. Amethyst a form of Quartz was first used by the Ancient Egyptians.

Explanation:

And i had the same question a few years back and got the question right

a countries leader should be motivated by the common good of the country.