Interactive calculators, visualizers, and comparators that turn science questions into things you can poke at. Every tool below opens on tools.scienceabc.com and is free to use, no signup. Use them, embed them, share them.
Linear & Quadratic Function Explorer
Drag sliders to reshape y = mx + b or y = ax² + bx + c. Slope, intercepts, vertex, axis of symmetry, discriminant, and roots update live, with standard, vertex, and factored forms of the parabola.
Open tool →Punnett Square Generator
Predict offspring genotypes and phenotypes for any cross. Monohybrid or dihybrid, with complete, incomplete, and codominant dominance modes — plus real biology presets (Mendel's peas, snapdragons, ABO blood type).
Open tool →How the Atomic Model Evolved
Step from Democritus to Dalton, Thomson, Rutherford, Bohr, and Schrödinger. Each entry shows the model's claim, the experiment that built it, and the finding that eventually broke it, with an SVG visualization of every model.
Open tool →Hardest Materials Compared
Sortable list of 21 materials by Mohs and Vickers hardness — from talc to diamond — with the predicted-but-unmeasured candidates (lonsdaleite, wurtzite BN) flagged honestly. Compare any two side by side.
Open tool →Periodic Table: Why It's Arranged That Way
Recolor the periodic table by block (s/p/d/f), period, group, atomic radius, ionization energy, or electronegativity. Click any element to see its electron configuration with the last-filled orbital highlighted and an explanation of why it sits in that exact row and column.
Open tool →How 1 + 2 + 3 + … = −1/12
Slide N up to 200 and watch the partial sums of 1+2+3+… race off to infinity (so the answer is not −1/12 by ordinary summation). Then walk through the Euler/Ramanujan heuristic step by step and see how the Riemann zeta function makes −1/12 the unique consistent value.
Open tool →Sunrise & Sunset Around the World
Pick any city and any date and see the sunrise time, sunset time, and day length, computed with the NOAA solar algorithm. Compare day length across latitudes for the same date, or watch one city's day-length curve through the year.
Open tool →Lactose Intolerance by Population
Look up the share of adults who can't fully digest lactose, by world region or specific ethnic group — from East Asians (~95%) and Native Americans (~100%) to Scandinavians (~4%) and Maasai pastoralists (~20%). Every figure cites the primary peer-reviewed study it comes from.
Open tool →360° Circle Explorer
Pick any angle from 0° to 360° and see it instantly as degrees, a fraction of a turn, radians, DMS, and sin·cos. Drag the slider, type a value, enter a fraction, or click a preset.
Open tool →Planet Rotation Explorer
Tap any planet (Mercury through Neptune) to see which way it spins, its axial tilt, and the length of its day. The two retrograde oddballs — Venus and Uranus — are flagged, and a sortable reference table puts all eight side by side.
Open tool →Throat Anatomy Explorer
Tap any labeled part of the throat — pharynx, epiglottis, trachea, esophagus — to learn what it does. Switch between breathing and swallowing modes to see how the epiglottis flips to keep food out of your airway.
Open tool →Cell Division Explorer
Step through every phase of mitosis, meiosis I, and meiosis II with animated chromosome diagrams. A side-by-side comparator highlights the differences, and a reverse "find a phase" lookup answers questions like "when do sister chromatids separate?"
Open tool →First Life on Earth Timeline
Scrub from Earth's molten birth 4.54 billion years ago to today through ten life-on-Earth milestones — first oceans, LUCA, the oldest fossils, the Great Oxidation, eukaryotes, the Boring Billion, and the Cambrian explosion.
Open tool →pH Scale Explorer
Drag a marker along a pH scale that extends from −3 to 17, with real substances pinned at their actual values — including the superacids and superbases that live outside the conventional 0–14 range. Compare any two substances and see how many times more acidic one is than the other.
Open tool →Post-mortem Timeline
Scrub the slider through the first 72 hours after death to see when pallor, algor, livor, and rigor mortis appear, peak, and fade. A separate comparison view puts the four mortises side by side.
Open tool →Electron Shell Explorer
Click any element on the periodic table and watch its electrons fill the K, L, M shells. See the valence shell highlighted, the octet status, and switch between Bohr diagram, shell notation (2, 8, 8, 18), and full Aufbau orbital configuration.
Open tool →Soil Horizon Explorer
Tap any layer of a soil profile to see its depth, color, composition, and biology — then switch between forest, grassland, desert, tundra, and tropical biomes to see how soils change with climate.
Open tool →The Sun's Life Timeline
Drag a scrubber through 4.6 billion years of past and ~7.7 billion years of future to see what the Sun looked like, looks like, and will look like — and what happens to Earth at every step.
Open tool →Dinosaur Size Comparator
Pick any two or three theropods (and Argentinosaurus for scale shock) and see their silhouettes side by side at true real-world scale, with a human for reference.
Open tool →Reactivity Explorer
An interactive periodic table heat-mapped by reactivity. Compare any two elements, see the metal and nonmetal trends, and find the top 10 most reactive elements.
Open tool →Electric Shock Calculator
Pick a voltage (from AA battery to lightning) and see what current it would drive through your body — then look up what each milliamp range actually does.
Open tool →USB Connector Identifier
Visual gallery of every USB connector type, with a transfer-speed calculator and a charger compatibility checker.
Open tool →Famous People IQ Lookup
Searchable database of documented and estimated IQ scores, with side-by-side comparison.
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