By Katrina Miller NASA and European scientists explain how they calculate the probability of the space rock 2024 YR4 impacting our planet, and why it’s not yet time to worry. By Robin George ...

The eye is not red and the eyelid is not swollen. Both sides are blocked in 30% of these children. Caused by blockage of the lacrimal duct. This duct carries tears from the corner of the eye to ...

Abstract: Atmospheric ducting has a significant impact on electromagnetic wave propagation. Radio signals that are trapped and guided by the atmospheric duct can travel a much longer distance over the ...