Rather than relying on external and 'often meaningless' features, such as greying hair or chronological age, biological age ...

Can Mars let humans age faster? It sounds more poetic than reality, but it may be true technically. Two identical clocks: One on Earth other on Mars, after months, they slowly drift apart. Space ...

After a long flight or a shift in schedule, many people experience persistent fatigue and a feeling of being out of sync with ...