Crimson ArchiveThe Physics Archive
THE LEARNING COLLECTION / VOL. 001

The Physics
Archive.

Watch the science. Explore the mathematics. Experiment with the models. Then follow the evidence for yourself.

Begin the first lesson ↗Browse the collection ↓
CURATED BY CALEB AIKENB.S. PHYSICS · UMASS AMHERST
01 / FEATURED LESSONTHE FIRST OPEN FILE ✳

ARCHIVE 001 · RELATIVITY / PARTICLE PHYSICS

Cosmic Muons:
Einstein's Relativity in Action.

Why can particles that live, on average, just 2.197 microseconds reach Earth's surface? Step inside a cosmic-ray shower and investigate the paradox with interactive models, two reference frames and a genuine experimental trail.

BEGINNER → INTERMEDIATE10–15 MIN LESSON5-QUESTION QUIZ
Explore the physics ↗
THE RELATIVISTIC KEY
γ = 1√(1 − β²)
β = v / cAT 0.998c → γ ≈ 15.82
02 / CATALOGUEA COLLECTION BUILT TO GROW

LESSONS & INTERACTIVE EXPERIENCES

Open an idea.

Every lesson is built around one question, a transparent model and a trail back to its sources. New entries appear when their material is ready.

01LESSON IN THE
COLLECTION
03 / HOW TO USE THE ARCHIVEFROM WONDER TO UNDERSTANDING

Four ways into a question.

01 / WATCHSee the phenomenon.

Start with the episode or the short explanation when the video is available.

02 / EXPERIMENTChange the variables.

Move sliders and explore what the model predicts—and what it omits.

03 / DERIVEFind the mathematics.

Move from intuition to equations at a comfortable level of detail.

04 / TESTCheck your understanding.

Try questions with immediate feedback, then follow the original research.

THE NEXT PAGE IS NOT WRITTEN YET

Some questions take a lifetime.
Start with one.

Enter Archive 001 ↗