○○○catch up⪢⪢
Whether we can oneday know everything, there is to know, we can't yet say. But we already know more than enough to keep you busy catching up for a while. So let's learn some physics.
http://qindex.info/i.php?x=14975
○○○piggyback⪢⪢
Flooded for months at a time, the wetlands are home to swarms of young creatures like the ugly ducklings, piggyback chicks and builders busy grooming themselves.
#bookmark
http://qindex.info/i.php?x=19465
○○○ piggyback ⪢⪢
