Islamic rituals sunnah hadith Quran guidance

Islamic rituals draw on more than the Quran

In Islam, many details of daily prayer, fasting, and pilgrimage come from the sunnah alongside the Quran. The sunnah is the record of Muhammad’s sayings and actions, preserved in hadith, and serves as a source of practical religious guidance.

A giant black hole can have the average density of water

≈ density of water

A black hole can contain an enormous mass while having a surprisingly low average density inside its event-horizon-sized region. For a black hole with 100 million times the Sun's mass, that average density is roughly similar to water.

A high-altitude gene variant spread quickly among Tibetans

≈3,000 years

Over roughly 3,000 years, a gene variant that helps people live at high altitude became very common among Tibetans. It is an example of how quickly natural selection can change a human population when the environment strongly favors a trait.

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Islamic rituals sunnah hadith Quran guidance

Islamic rituals draw on more than the Quran

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