০৪Interactive
A River Inside the Wire
Electricity from the atom to the power station, in 141 pages and 54 chapters — with an interactive edition whose figures you can actually pull apart.
141 pagesEnglish + BanglaFree
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Four shelves
Pick a shelf. Everything on it is real, running, and yours to test.
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০৬
Hand in Hand
Why anything sticks to anything else. Chemical bonds from the electron outward — salt, water, diamond and DNA all explained by the same idea.
97 pagesEnglish + BanglaFree
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০১
A Brain in a Glass Bowl
Living brain cells, grown in a dish, learning to play a video game — and what that tells us about thinking itself.
41 pagesBanglaFree
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০২
Letters Made of Light
Every star you look at is a letter posted years ago. This book is about how big the universe really is — and why small does not mean unimportant.
73 pagesBanglaFree
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০৩
Little by Little
Calculus built from nothing, for a reader who has only ever done algebra — sixty figures, no hand-waving, both languages.
96 pagesEnglish + BanglaFree
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