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Shikkha Web Ask is the question-and-answer platform of the Shikkha Web network — an open archive of the questions students in Bangladesh actually ask about SSC and HSC, admission tests, science and everyday study, together with the answers.

Whether you are stuck on one line of a textbook or trying to work out what a department actually teaches, the answers here come from people who know the subject: students, teachers and working professionals. The most useful answer is marked as selected and floats to the top, so one person’s question keeps helping everyone who asks it later.

Reading is completely free and needs no account. Shikkha Web also runs a blog, a Science Club and an English Club, all with the same goal: putting reliable information within everyone’s reach.

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Why do stars twinkle but planets do not?

Why does a mirror reverse left and right?

Why is the sky blue?