Plants are slow, which is exactly why they make good experiments — there is time to think between measurements. These plant growth experiments all use fast-growing seeds: radish, cress, or beans, which show a measurable change within three to five days. Before You Start Two rules fix almost every failed plant experiment. Use at least … Read more
Disclosure: Some links on ScienceBases are affiliate links, which means we may earn a commission if you buy through them. That never changes what we recommend or how we score it — see “How we assessed this” below for the method behind every rating. Shopping for the best microscopes for kids goes wrong in a … Read more
Without enzymes, the reactions keeping you alive would be far too slow to matter. The breakdown of a single molecule of sucrose into simple sugars takes years in plain water; with the enzyme sucrase, it happens thousands of times per second. That speedup, a factor of about a trillion, is typical rather than exceptional. Here … Read more
Every cell in your body carries about 6 feet of DNA, packed into a space a thousand times narrower than a human hair. Your body has roughly 30 trillion cells. Laid end to end, the DNA inside you would stretch billions of miles. So how does dna work as a physical object? It is a … Read more
Your body holds somewhere around 30 trillion cells, and you also host roughly 38 trillion bacteria — which means most of the cells in “you” are not human. Ask a biologist what is a cell and you get a definition with three parts: a membrane that separates inside from outside, a set of instructions, and … Read more