Learn how the present value interest factor (PVIF) formula helps evaluate the current value of future sums and analyze annuities effectively.

We went hands-on with 17 popular dry shampoos, testing them on a range of hair and scalp types at various stages of cleanliness to find the very best ones.

The COVAX global vaccine sharing programme sent "indicative volumes" of estimated shots to 190 countries over the weekend, senior World Health Organization adviser Bruce Aylward said on Monday.