Using saliva to detect disease holds promise, but it's not perfected yet

Easier than a blood test, saliva tests have the potential to detect cavities, infections and even cancer. But a lack of ...
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Physics tutorial: Finding the current to deflect a compass needle

Learn how to find the current needed to deflect a compass needle in this step-by-step physics tutorial! Explore the principles of magnetic fields, current-carrying wires, and the interaction with a ...