From the World's First Stock Exchange to Ultrasound Waves

Issue 29

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1. The first stock exchange was established in the Netherlands – the Dutch Stock Exchange. The Dutch East India Company (VOC) held the first ‘initial public offering’ (IPO) in August 1602.

2. Small pox killed more than 300 million people in the 20th century

3. The US Electric Grid has 3 sections three regional power grids: Eastern, Western, and Texas.

4. Because ultrasound sound waves have a difficult time traveling through the air, ultrasound gel is used to reduce the air gap between the patient and the transducer. It reduces acoustic impedance and reflection to allow for a clear image to be produced.