Courses

Elementary Science
This course provides an introduction to elementary science concepts and is optimal for grades 5-8.

Lessons

**21** Scores
Blood Simple
Physicians are testing a synthetic blood to see how efficiently it transports oxygen.

**13** Scores
Fossils
Fossils found in marble that was destined to be a high end counter top.

**2** Scores
Viruses
Introduction to viruses: structure, lytic and lysogenic cycles.

**1** Scores
Biobanking
The rise in popularity of warehousing human tissue for future research.

**4** Scores
Bacteria
Introduction to bacteria. Differences between eukaryotic and prokaryotic cells.

**2** Scores
DNA Vocabulary
The vocabulary of DNA: chromosomes, chromatids, chromatin, transcription, translation, and replication

**97** Scores
How Big is Our Universe?
Learn about our place in the universe through a discussion with researchers at the Keck Observatory, which houses some of the most powerful telescopes in the world.

**96** Scores
Adding/Subtracting Negative Numbers
Understand subtraction of rational numbers as adding the additive inverse, p – q = p + (–q). Show that the distance between two rational numbers on the number line is the absolute value of their difference, and apply this principle in real-world conte

**107** Scores
Compute Unit Rates / Ratios of Fractions
Compute unit rates associated with ratios of fractions, including ratios of lengths, areas and other quantities measured in like or different units. For example, if a person walks 1/2 mile in 1/4 hour, compute the unit rate as the complex fraction 1/2/1/4

**8** Scores
Add/Subtract Rational Numbers
Apply and extend previous understandings of addition and subtraction to add and subtract rational numbers; represent addition and subtraction on a horizontal or vertical number line diagram.

**13** Scores
Opposite Quantities
Situations in which opposite quantities combine to make 0. For example, a hydrogen atom has 0 charge because its two constituents are oppositely charged.

**15** Scores
Rounding Decimals
When rounding decimals, round up to the next digit in the sequence if the digit is equal to or greater than five. Round decimals to specific decimal places using tips from a math tutor in this free video on math skills.

**10** Scores
Banking
Introduction to how banks make money and the value they (potentially) add to society.