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  90% of US adults say the United States is experiencing a mental health crisis, CNN/KFF poll finds

• After promising data, experts say many questions remain over an experimental Alzheimer's drug

• US suicide rates rose in 2021, reversing two years of decline

• ALS drug gets FDA approval despite uncertainty about effectiveness

• Two concussions don't always add up to second impact syndrome

• US monkeypox deaths are rare; here's why they can be difficult to confirm

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