Running on two AAA batteries, the thermometer keeps its last 20 readings stored in its memory so you can keep track of trends over time. (geekwrapped.com)
The data will shine a light on achievement gaps, as well as trends over time in the performance of fourth and eighth graders. (ewa.org)
Bottom: An «anomaly plot»; the annual global temperature trend over time where the average from 1951 — 1980 is set to 0. (slate.com)