+$A specific protein found only in male dogs may trigger pet allergy symptoms in some people.
+$Gingko biloba trees guard a secret fountain of youth
+$January 14, 2020, 3 p.m. byMary Jo DiLonardo
+$The ginkgo biloba is unlikely to ever die of old age, researchers say, though it does succumb to stressors like drought.
+$Scientists just found the oldest material on Earth — and it smells funny
+$January 14, 2020, 1:48 p.m. by本博爾頓
+$7 billion-year-old stardust found on meteorite that landed in Australia about 50 years ago.
+$What you can see on fee-free days at U.S. national parks this year
+$January 14, 2020, 12:31 p.m. by諾埃爾柯克帕特裡克
+$Plus, the fee-free days for wildlife refuges, national forests and more protected wilderness areas.