College Physics

Why are 90% of humans right-handed? We may finally have the answer.

About 90% of humans prefer their right hand, a level of dominance that makes us a complete outlier in the primate world. For decades, scientists have struggled to explain why this trait became so extreme in our species compared to other apes. Now, a major new study of 41 primate species, published in PLOS Biology, suggests the answer lies in two transformative evolutionary shifts: the transition to walking upright and the massive expansion of the human brain.

By analyzing over 2,000 individuals, researchers found that once they accounted for bipedalism and brain size, humans no longer looked like an evolutionary anomaly.

The findings indicate that as our ancestors stood up on two legs, their hands were freed from the demands of movement, creating the pressure for specialized manual skills. This initial bias was then supercharged as the human brain grew more complex. While early hominins likely had only mild hand preferences, later species like Homo erectus and Neanderthals developed the intense right-handedness we see today. Though the persistence of left-handedness remains a mystery, the study confirms that our dominant hand is a direct byproduct of the very traits—walking upright and high intelligence—that defined the rise of humanity.

source: Püschel, T. A., Hurwitz, R. M., & Venditti, C. (2026). Bipedalism and brain expansion explain human handedness. PLOS Biology.

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Solve this:
x + y = 1
x − y = 0
So… what is x × y?

Drop your answer in the comments 👇
No calculators! 🧠


Credits: Interesting Engineering

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For the first time, researchers have visualized the moment life begins.

And they uncovered a universal mathematical code shared by both microscopic cells and the vast cosmos.

MIT researchers have successfully captured the precise instant of fertilization, a moment previously hidden from the eyes of science. The process begins with the simultaneous activation of billions of proteins, which send rhythmic, spiraling waves across the egg's membrane. These waves act as a biological starting gun, providing the essential instructions for every subsequent cell division and fold that ultimately builds a living organism. Without this coordinated signal, the mechanical process of life simply cannot proceed, marking these waves as the fundamental catalyst for existence.

The discovery's most profound aspect is the mathematical resonance between a single cell and the macro world. Researchers observed that the spiraling wave patterns seen at the dawn of life are identical to those found in massive ocean currents, atmospheric circulation, and even quantum fluids. This reveals a stunning symmetry in nature, suggesting that the same fundamental laws of physics governing planetary systems are hardwired into the very first moments of human development, bridging the gap between cellular biology and the mechanics of the universe.

source: MIT News. The starting gun of life: MIT researchers observe the first moments of fertilization. Massachusetts Institute of Technology.
Credits Hashem Al-Ghaili

Can you make a word from this? 🤔