Lesson: The Dark History of Arsenic

📌 Before You Watch:

Have you ever heard of arsenic? What do you already know about this deadly substance?

📖 Key Vocabulary:

1) Usurp (v)- to take a position of power or importance illegally or by force e.g. 'Richard usurped the throne.'

2) Ally (n)- to be on someone's side (person or country) e.g. 'The UK and USA are considered to be allies.'

3) Inconspicuous (adj)- not visible or attracting attention e.g. 'Dressed in dark clothing, the man was inconspicuous.'

4) Prevalent (adj)- widespread e.g. 'This disease is not as prevalent as it once was.'

5) To run rampant (phrase)- wild or out of control e.g.  'The stray dogs ran rampant throughout the town.'