Irresponsible Knife User of the Day: Sir Isaac Newton Edition

Man Calmly Walks Into Hospital With Knife In Head

Note to Mr. Wu…Mr. Yunzhi Ziao would appreciate you refraining from leaving knives in your balcony flowerpots in the future.

Remarkably, in the intervening 20 years since I took high school physics I have not killed the brain cell remembering that gravitational acceleration on Earth is 9.8m s/2. Guangyuan, China resident Yunzhi Ziao is intimately familiar with gravity as a practical matter as he was struck in the head with a knife while taking a walk last week. Unlike many Chinese stabbings, it wasn’t an attack by Uighur Separatists. Instead, a “Mr. Wu” who lived in the apartment whose balcony Ziao happened to be walking by told police that he had left the knife in a flower pot and the wind blew it over.


“It hurt a lot,” Xiao told NBC News from his hospital bed. “I cried out, ‘My head! My head hurts!’ but I did not know what had happened.” A street vendor shouted at Xiao, “There is a knife in your head!” He managed to walk another 100 yards before the pain became too much and he was forced to sit down at a phone booth. “Some warm-hearted people passing by saw me bleeding and called the police who took me to a traditional Chinese medicine hospital,” Xiao added. “A few hours later doctors took the knife out of my head.”

According to the UK Telegraph, the balcony of the High-rise apartment was 8 stories high. Assuming a height of 3m/story that would mean the knife was travelling at approximately 21.7 meters/s when it stuck Mr. Xiao. Or about 48.5 miles per hour for those of us here in the States. Ouch.(thanks – I was lazy).

Gravity is not just a good idea. It’s the law.


  1. RCH024 says:

    9.8 m/s^2

    1. gracias

      (I wasn’t sure the exact notation for “Squared” – I did know the formula)

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Irresponsible Knife User of the Day: Sir Isaac Newton Edition

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