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Reflection: a wave hits a surface, and bounces back into the medium it was originaly in

Refraction: a wave enters a medium with a different refractive index to the original medium it was travelling...

In Ancient Greek, the aorist is the equivalent to our simple past. There are two forms of aorists: the sigmatic first aorist and the thematic second aorist.

The sigmatic first aorist is formed on t...

Starting with ∫a^x dx ,
We can re-write a^x using logs as e^ln(a)*x using some of their properties
We use the substitution u = ln(a)*x (as such du/dx = ln(a)) all...

The simplest way to form any present subjunctive is to take the verb, conjugated in the present indicative and put it the third person plural. Let's take the verb 'finir' as an example. The third person p...

These animals are more likely to pass on (recessive) disorders, and subsequently more likely to be susceptible to diseases.