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Asphalt, concrete, and dark roofs absorb more of the Sun’s energy.

France adopted it in 1854, two years after his death.

Food containing protein can supply amino acids, the building blocks used in this process.

A wider or denser mangrove belt may provide more attenuation than a narrow or broken one.

Mangrove forests grow in tropical and subtropical intertidal zones, where land is regularly covered by salty or brackish water.

Active noise-canceling (ANC) headphones are not magic walls that remove every sound.

Scientists sometimes describe this large circulation as a global conveyor belt.

As texts circulated more widely, readers in distant places had more opportunities to encounter the same words.

Researchers record brain activity, eye movement, and muscle condition to classify sleep into two broad types: non-REM sleep and REM sleep.

Different combinations could represent letters, numbers, and punctuation.

However, much of the early rise in protein synthesis after unfamiliar exercise may be directed toward repairing and reorganizing tissue rather than adding new contractile material.

This movement is called an ocean current.

Currents are driven by wind, tides, and differences in water density.

Before a voyage, an officer compares this information with the ship's draft, or how deeply the vessel sits in the water.

Roots also help hold that sediment in place, which can reduce ordinary shoreline erosion.

Instruments called seismographs record those waves, and scientists use the records to estimate the earthquake’s size.

In forests and fields, trees provide shade, while evaporation from plants and soil cools the environment.

Visitors read newspapers, discussed politics, listened to the latest news, and exchanged ideas with people from different occupations.

Instead of copying shapes designed for the eye, it was designed for the fingertip.

They can warn sailors about rocks, shallow water, or the entrance to a harbor.

True hypertrophy means a lasting increase in muscle proteins and contractile units, and it develops through repeated training over weeks, not through one episode of damage.

Johannes Gutenberg combined a mechanical press with a method for making uniform, interchangeable metal type.

This is called destructive interference, and it reduces the noise you hear.

Mangrove forests grow in tropical and subtropical intertidal zones, where land is regularly covered by salty or brackish water.

Cushions or ear tips physically block some outside sound; this is passive isolation.

Families could shop less often, plan several meals, and keep leftovers for later.

A lighthouse is a tall building near the sea.

Manuscripts and printed books existed together for a long time.

Merchants met customers, compared prices, and arranged deals.

Printed works survive from eighth-century Japan, and metal movable type was used in Korea before Gutenberg's time.

A nautical chart turns much of this hidden world into information that mariners can read.

As networks expanded, telegraph lines often followed routes such as railroads.

When the two waves reach your ear at nearly the same time, they overlap.

Light-colored roofs and pavements can reflect more sunlight instead of absorbing it.

Perishable food can travel farther as long as each link remains cold.

Before reliable refrigeration, people preserved food with methods such as drying, salting, and storing it with ice.

An operator could open and close an electrical circuit, sending pulses along a wire.

Before reliable refrigeration, people preserved food with methods such as drying, salting, and storing it with ice.

These surfaces store heat during the day and release it slowly after sunset.

Resistance exercise creates a temporary demand for repair and remodeling.

Rather than making every book immediately cheap, its central strength was the ability to reproduce a text in multiple copies from the same setting of type.

They are one layer of coastal resilience, not a guarantee against flooding.

They can warn sailors about rocks, shallow water, or the entrance to a harbor.

As tidal water moves through the roots, friction slows the flow, and fine sediment can settle.

Below the water are the seafloor, shoals, rocks, and shipwrecks—much of what sailors cannot see directly.

The same caution applies to soreness.

Depth numbers, called soundings, show measured water depths, while contour lines connect places of similar depth.

Lower temperatures slow the growth of many bacteria and delay changes that make food spoil.

Steady sounds are easier to predict than sudden or rapidly changing sounds.

Long-period storm surge may travel much farther through a forest than short wind-driven waves.

This pattern is called an urban heat island because the city becomes an island of higher temperature than its surrounding areas.

Charts begin with surveys.

That distinction matters because the first visible increase in muscle size can partly reflect swelling.

A bout of resistance exercise raises muscle protein synthesis during recovery.

These places offered something different from traditional taverns.

Before the electric telegraph, information transmitted over a long distance was attached to a physical object.

Its first stage is a short transition between wakefulness and sleep.

Before the electric telegraph, information transmitted over a long distance was attached to a physical object.

Muscle tissue is in constant turnover: old or damaged proteins are broken down while new proteins are made.

Vivid dreams often occur during REM sleep, although the major muscles normally become very relaxed.

Farms, refrigerated vehicles, warehouses, shops, and home refrigerators form a connected cold chain.