History
The Great Depression by History.com
Science
How To Measure Volts, Amps, Watts, & Ohms with a Multimeter by GalcoTV
Math
Math Antics – What Are Percentages? by Mathantics
English
Phrases, Clauses, and Sentences by Shmoop
Geography
Paris | national capital, France | Britannica.com
Madrid | national capital, Spain | Britannica.com
Barcelona | Spain | Britannica.com
Rome | national capital, Italy | Britannica.com
Budapest | national capital, Hungary | Britannica.com
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