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explainer Physics

How far is a click? Klick meaning, conversions and origin

A click (klick) is military slang for one kilometre: 1,000 m, about 0.62 miles. See conversions, why 1 km Army map grids made it useful, and its origin.

By Murad Ali Khan October 14, 2026 8 min read

Fossil skeleton of Megacauda sungei shown three ways: a photograph of the dark skeleton and broad tail on a rock slab, an X-ray fluorescence image with the bones in yellow, and a labelled line drawing of the skull, hyoids, ribs, limbs and tail.

news Biology Evidence status: Peer reviewed · Single fossil specimen

Jurassic swimming mammal relative hints suckling anatomy evolved early

A 165-million-year-old swimming relative of mammals kept throat bones like ours. What the Nature fossil shows, how, and why it rests on a single…

October 14, 2026

A California two-spot octopus, one of the three cephalopod species in the study, resting among green seagrass

news Biology Evidence status: Peer reviewed · Genomics study (embryos and tissues)

Octopus and squid DNA forms flexible loops linked to brain development

A Nature Communications study maps how DNA folds in squid, cuttlefish and octopus: stable domains, shifting loops, and one switch deletion that shrank brains.

October 13, 2026

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Space

Planets, moons, stars and black holes, with the mission data behind each number.

explainer Astronomy

How long does it take to get to Mars? Mission times and the math

Explainer Space

Gravity on other planets: surface gravity of planets and major moons

News Astronomy Evidence status: Peer reviewed · Telescope observations

Hubble Finds a Giant 10-Sided Wave Around Saturn’s South Pole

News Astronomy Evidence status: Peer reviewed · Observational study with forward modelling

The Universe Is Making Fewer Stars—but It Hasn’t Run Out of Fuel

News Physics Evidence status: Preprint · Single anomalous event

LUX-ZEPLIN Recorded One Unexplained Flash—Not Dark Matter Yet

News Astronomy Evidence status: Peer reviewed · Model-based geophysical inference

Mars Is 200–400°C Hotter Beneath Its Southern Highlands

News Physics Evidence status: Peer reviewed · Laboratory aerospace experiment

Magnetic “Brakes” Push Reentry Plasma Away From Spacecraft

News Astronomy Evidence status: Official announcement · Confirmed mission event

NASA’s Roman Space Telescope Launches to Map the Dark Universe

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Physics

Gravity, quantum behaviour and fundamental forces, with the calculations shown.

news Physics Evidence status: Peer reviewed · Laboratory experiment

Thorium nuclear clock runs for a day, but still trails atomic clocks

explainer Physics

How does an atomic clock work? Caesium, accuracy and GPS

Explainer Space

Gravity on other planets: surface gravity of planets and major moons

News Physics Evidence status: Peer reviewed · Quantum interferometry experiment

Falling Quantum Atoms Pass a New Test of Einstein’s Gravity

News Chemistry Evidence status: Peer reviewed · Laboratory materials study

Scientists Made Titanium Float—even after the Material Cracked

News Chemistry Evidence status: Peer reviewed · Ultrafast spectroscopy and model-based reconstruction

Scientists Reconstruct an Exciton’s First 400 Femtoseconds

News Physics Evidence status: Preprint · Single anomalous event

LUX-ZEPLIN Recorded One Unexplained Flash—Not Dark Matter Yet

News Physics Evidence status: Peer reviewed · Laboratory aerospace experiment

Magnetic “Brakes” Push Reentry Plasma Away From Spacecraft

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Biology

Genes, evolution and living systems, with study design and sample sizes made clear.

news Biology Evidence status: Peer reviewed · Single fossil specimen

Jurassic swimming mammal relative hints suckling anatomy evolved early

news Biology Evidence status: Peer reviewed · Genomics study (embryos and tissues)

Octopus and squid DNA forms flexible loops linked to brain development

news Biology Evidence status: Peer reviewed; observational study of pet dogs

Why big dogs die younger: DNA study finds faster epigenetic ageing

news Biology Evidence status: Mouse study · Peer reviewed

Hidden drainage route found at the back of the eye in mice, but its glaucoma link is untested

News Biology Evidence status: Peer reviewed · Genome-wide association study

What Shapes Personality? Study Finds 1,260 DNA Variants—but Genes Aren’t Destiny

News Biology Evidence status: Peer reviewed · Mouse study

Can Ozempic Slow Aging? Semaglutide Extended Lifespan in Older Female Mice

News Biology Evidence status: Peer reviewed · Human genetic association study

Scientists Identify 36 Risk Genes Linked to OCD and Tic Disorders

News AI Evidence status: Preprint · Laboratory bacteriophage study

Scientists Mutated Nearly Every DNA Letter in a Virus—and AI Missed Many Effects

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Health

Medical research read carefully: mouse, cell and human evidence kept distinct.

news Biology Evidence status: Mouse study · Peer reviewed

Hidden drainage route found at the back of the eye in mice, but its glaucoma link is untested

News Biology Evidence status: Peer reviewed · Mouse study

Can Ozempic Slow Aging? Semaglutide Extended Lifespan in Older Female Mice

News Biology Evidence status: Peer reviewed · Human genetic association study

Scientists Identify 36 Risk Genes Linked to OCD and Tic Disorders

News AI Evidence status: Peer reviewed · Cross-sectional study

AI Emotional Support Is Linked to Distress in Young People

News Biology Evidence status: Peer reviewed · Laboratory and genomic study

Tuberculosis May Evolve Drug Resistance While Drying in Air

News Biology Evidence status: Peer reviewed · Cell and tissue imaging study

Self-Blinking Probes Image DNA Near Double-Helix Resolution

News Biology

Doctors Injected Mitochondria From a Woman’s Leg Into Her Eyes

News Biology

Two Injections Improved Memory in Alzheimer’s-Model Mice—Not Humans

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Earth

Climate, geology and oceans, traced back to measurements and official records.

news Earth Evidence status: Peer reviewed · Modelling study

Great Unconformity: a vanished cliff may explain the Grand Canyon’s missing billion years

Explainer History

The Most Ancient Civilization In The World

Explainer Earth

Why Is Water Blue In Color?

Explainer Earth

Why Is The Dead Sea So Salty?

Explainer Earth

What If The Earth’s Core Stops Spinning?

Explainer Earth

From Crust To Core: A Detailed Look At The Layers Of Earth

Explainer Earth

What Lives In Mariana Trench?

Explainer Environment

The Doomsday Glacier: A Ticking Time Bomb For Rising Seas

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