Second (s)
Definition: Second na SI base unit for time. Dem define am with radiation frequency of cesium-133 atoms.
History/origin: Dem first take second from day, but for 1967 dem redefine am with atomic definition to get better precision and stability.
Current use: Seconds dey used everywhere for science, engineering, computing, sports, finance, and everyday life.
Week (wk)
Definition: Week na seven-day calendar interval wey people dey use to group work, school, religious, and planning cycles.
History/origin: Seven-day cycles spread through ancient religious, astronomical, and civic traditions before e enter modern international calendars.
Current use: wk dey common for work schedules, class plans, sprint planning, pregnancy tracking, subscriptions, recurring chores, rent cycles, and short-term goals.