General reference

Light synthetic hikers and trail runners: nearly none — a few short wears.

As long as possible: until the child reaches the maximum height or weight of their rear-facing seat — typically 40–50 lb…

Most car seats expire 6–10 years after their date of manufacture — not the purchase date.

Until the vehicle seat belt fits properly on its own — usually when the child is about 4 ft 9 in (145 cm) tall…

Most vegetables are started indoors 4–10 weeks before your area's average last frost date: tomatoes 6–8 weeks, peppers and eggplant 8–10…

About 100–140 days from sowing to first ripe tomato: 5–10 days to germinate, 6–8 weeks indoors to transplant size…

Pick a bag rated 10–15°F LOWER than the coldest night you expect: a 20°F bag for typical 3-season camping, 30°F+ for summer…

Trail runners and lightweight synthetic hikers are wearable straight from the box.

The consensus pick among astronomy educators is a 6–8 inch Dobsonian reflector: the most aperture per dollar on the simplest possible mount.

Per the ASPCA's toxic-plant database: spider plants, Boston ferns, areca and parlor palms, calathea, peperomia, African violets…