Devotional Archives

Bird egg designs.

Not all eggs are the same; they come in a variety of sizes, colors, and shapes. Robins have oval eggs that fit nicely in their

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Baffling bat sonar.

Bats have the extraordinary ability to close their ears as they send sonar signals and reopen them in time to hear returning echoes. They do

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Did immune systems evolve?

Biological immune systems can recognize bacteria, viruses, and toxins that invade the body. Each system can quickly mobilize just the right type of defenders to

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