What do human tears primarily consist of chemically?

Water and salt

What position does Viktor Krum play in Quidditch? Who holds the record for the most Grand Slam men's singles titles as of 2023? In Switzerland, what event involves costumed groups parading through towns ringing large cowbells around Christmas? Which medieval saint developed a famous Rule for monastic life around the 6th century? What type of electromagnetic radiation do microwaves belong to?