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Residents look at the damaged hotel ‘Ane Centro’ after a 8.1 magnitude earthquake in Matias Romero, Oaxaca, Mexico. Angel Hernandez/AAP

Explainer: after an earthquake, how does a tsunami happen?

A 8.1 magnitude earthquake hit off the coast of Mexico on 8 September 2017. Fortunately, initial fears of a damaging tsunami hitting the coastline now appear unfounded.
Lasers being shone from the European Southern Observatory’s Very Large Telescope in Chile. These lasers help remove the twinkles in the night sky and help astronomers see stars clearer on Earth than ever before. F. Kamphues/ESO

Curious Kids: Why do stars twinkle?

How exactly do the stars twinkle in the night sky? As it turns out, the answer is full of hot air... and cold air.
The evidence so far suggests off-label prescribing for insomnia places users at unnecessary risk of harm. Flavio Ronco/Flickr

Explainer: what is Seroquel and should you take it for insomnia?

Quetiapine, sold under the brand name Seroquel, is a short-acting antipsychotic drug to treat major mental illnesses. It has also been increasingly prescribed off-label for insomnia.
Throughout Australian history, previous parliaments have changed the legal understanding of marriage – none needed a plebiscite. AAP/Lukas Coch

Explainer: with no free vote for now, where next for marriage equality?

The government seems determined to give voters a voice on marriage equality, and equally determined not to be bound by what those voters say.
Earth, shot from space, as it absorbs and reflects rays of light coming from the Sun - the same white-looking rays that give our sky its colour. NASA

Curious Kids: Why is the sky blue and where does it start?

Some people think the sky is blue because of sunlight reflected off the ocean and back into the sky. But that's not the real reason.
There is a common misunderstanding that one particular Qur’anic verse perpetuates violence against women. AAP/Lukas Coch

Explainer: what Islam actually says about domestic violence

Islam’s position on domestic violence is drawn from the Qur’an, prophetic practice, and historical and contemporary legal verdicts.
A compactor at work on Australian landfill. via Wikimedia commons

Explainer: how much landfill does Australia have?

Australia sends 20 million tonnes of garbage to landfill every year. With thousands of sites across the nation, it's hard to track exactly how many there are, where they are, and what's filling them.
Chemotherapy is the use of drugs to treat cancer. It is often paired with surgery, radiotherapy and immunotherapy in a cancer treatment plan. From Shutterstock,

Explainer: what is chemotherapy and how does it work?

Chemotherapy is the use of drugs to treat cancer. It is often paired with surgery, radiotherapy and immunotherapy in a cancer treatment plan.
Classified documents. www.shutterstock.com

What is classified information, and who gets to decide?

A professor who once held top secret clearance explains how levels of classification work and where handling sensitive information gets tricky.
B.A. Santamaria (left) played a significant role in the Labor split and the formation of the Democratic Labor Party. Wikimedia Commons

Australian politics explainer: the Labor Party split

Viewed from today’s post-Cold War and secularised society, the conflicts at heart of the Labor split appear curiously arcane. Yet its ghosts remain.

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