Daily True or False
August 19, 2026
10 true or false questions from this day's daily challenge. Click each one to reveal the answer and explanation.
1.Vincent van Gogh sold only one painting during his lifetime.
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Medium
Vincent van Gogh sold only one painting during his lifetime.
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Van Gogh sold 'The Red Vineyard' to Anna Boch in 1890 for 400 francs. This was the only confirmed sale of his work while he was alive.
2.Hammerhead sharks have a specialized sensory system that can detect the heartbeat of prey buried in sand.
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Hard
Hammerhead sharks have a specialized sensory system that can detect the heartbeat of prey buried in sand.
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Hammerhead sharks possess ampullae of Lorenzini, electroreceptors that sense electric fields—including the faint heartbeat of hidden prey like stingrays.
3.Piranha are found in oceans and saltwater environments worldwide.
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Easy
Piranha are found in oceans and saltwater environments worldwide.
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Piranha are strictly freshwater fish, inhabiting rivers and lakes in South America. They cannot survive in saltwater oceans.
4.Dolphins can only breathe voluntarily, meaning they can't breathe automatically.
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Medium
Dolphins can only breathe voluntarily, meaning they can't breathe automatically.
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Dolphins are conscious breathers; they must decide to take each breath, which is why they never fully sleep and only rest half their brain at a time.
5.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.
6.Artemisia Gentileschi painted a famous version of Judith Slaying Holofernes showing the biblical scene with graphic violence.
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Easy
Artemisia Gentileschi painted a famous version of Judith Slaying Holofernes showing the biblical scene with graphic violence.
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Artemisia Gentileschi's 1620 painting Judith Slaying Holofernes depicts the beheading with striking realism and blood, a hallmark of her dramatic Baroque style.
7.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.
8.Stick insects are venomous and their bite can cause serious harm to humans.
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Medium
Stick insects are venomous and their bite can cause serious harm to humans.
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Stick insects are not venomous and rarely bite. They are herbivorous and harmless to humans. Some species may spray irritants, but that is not venom nor a bite.
9.Gustave Courbet's painting 'The Stone Breakers' survived World War II and was later displayed at the Louvre.
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Medium
Gustave Courbet's painting 'The Stone Breakers' survived World War II and was later displayed at the Louvre.
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The painting was destroyed in the 1945 bombing of Dresden; it never entered the Louvre, and only photographs of it remain.
10.Pablo Picasso painted The Starry Night in the year 1889.
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Medium
Pablo Picasso painted The Starry Night in the year 1889.
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The Starry Night was painted by Vincent van Gogh in 1889. Picasso was only eight years old at the time.
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