Cleanliness and sanitation had a major impact on saving lives in the 1800s. The use of sterilization techniques help reduce infection.
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Welding began during the Bronze Age. Pieces were welded together by adding molten metal where they joined. Blacksmiths weld by heating and hammering pieces together. Oxy-acetylene welding began in the mid to late 1800s when oxygen was finally produced cheaply. Arc welding began in the early 1900s. TIG was designed to weld aluminum during WWII.
Homosexuality began wherever life on Earth began.Homosexuality began with the dawn of animal life on Earth.
Began is the past tense of begin.
It began when hunter/gathers began to form villages and communities. That was around 20,000 years ago.
Begin is the present tense of began.