Daily True or False
July 11, 2026
10 true or false questions from this day's daily challenge. Click each one to reveal the answer and explanation.
1.Al-Khwarizmi invented the concept of zero, which revolutionized mathematics forever.
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Medium
Al-Khwarizmi invented the concept of zero, which revolutionized mathematics forever.
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Zero was developed independently in ancient India (by Brahmagupta) and Mesoamerica; Al-Khwarizmi helped popularize the Hindu-Arabic numeral system but didn't invent zero.
2.Jordan was named Defensive Player of the Year in the same season he won his first MVP.
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Medium
Jordan was named Defensive Player of the Year in the same season he won his first MVP.
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In 1988, Jordan won both MVP and Defensive Player of the Year—a rare combo. He also led the league in scoring and steals that season.
3.Elon Musk has a cameo as himself in the movie Iron Man 2.
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Hard
Elon Musk has a cameo as himself in the movie Iron Man 2.
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Elon Musk appears as himself in Iron Man 2 (2010) at a Monaco party, where he talks to Tony Stark about an electric jet.
4.The Fukushima disaster led to a global phase-out of all boiling water reactors.
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Hard
The Fukushima disaster led to a global phase-out of all boiling water reactors.
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Many countries continued using BWRs with safety upgrades. Only Japan and Germany significantly shifted away from nuclear power.
5.Artemisia Gentileschi was the daughter of the painter Michelangelo Merisi da Caravaggio.
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Medium
Artemisia Gentileschi was the daughter of the painter Michelangelo Merisi da Caravaggio.
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Caravaggio had no known children. Artemisia's father was Orazio Gentileschi, a contemporary of Caravaggio but a different painter entirely.
6.Marina Abramović collaborated with Ulay on the performance 'The Great Wall Walk' in 1988.
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Medium
Marina Abramović collaborated with Ulay on the performance 'The Great Wall Walk' in 1988.
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Abramović and Ulay each walked 2,500 km from opposite ends of the Great Wall of China to meet in the middle, ending their artistic and personal partnership.
7.John Singer Sargent produced over 900 oil paintings and many watercolors.
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Medium
John Singer Sargent produced over 900 oil paintings and many watercolors.
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John Singer Sargent was highly prolific. His catalog includes roughly 900 oil paintings and more than 2,000 watercolors, plus drawings and sketches.
8.Leonardo da Vinci designed a mechanical knight that could sit, stand, and move its arms.
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Hard
Leonardo da Vinci designed a mechanical knight that could sit, stand, and move its arms.
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In his notebooks, Leonardo da Vinci designed a mechanical knight with gears and pulleys that could sit, stand, and move its arms. It is considered an early robot concept.
9.Saltwater crocodile has a venomous bite that can paralyze its prey.
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Easy
Saltwater crocodile has a venomous bite that can paralyze its prey.
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Saltwater crocodile has no venom glands. Its bite relies on immense crushing force, not toxins, to subdue prey.
10.Morgan Freeman was once a professional race car driver in the 24 Hours of Le Mans.
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Hard
Morgan Freeman was once a professional race car driver in the 24 Hours of Le Mans.
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Freeman is an actor and car enthusiast, known for narrating racing documentaries like 'NASCAR: The IMAX Experience,' but he has never been a professional race car driver and never competed in the 24 Hours of Le Mans.
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