The Matrix first hit theatres in 1999, and it’s safe to say it’s been living rent-free in our minds ever since. This sci-fi ...

I tested the Shark Matrix Plus 2-in-1 Self-Empty, which can vacuum, mop and empty its own bin. Happy days. As you might expect from Shark, this smart little robot packs plenty of techy features.

In matrix algebra, the inverse of some matrix A is a matrix Ainv if A * Ainv = Ainv * A = I, where * indicates matrix multiplication, and I is the identity matrix (1.0 values on the upper-left to ...