A simple letter swap in a viral puzzle is testing the limits of focus and perception as users race to find the hidden word.

The Matrix Reloaded is set to be one of the biggest blockbusters of all time, rocketing its ruthless baddies, the Virus Twins, to overnight stardom. Yesterday they celebrated their 35th birthday ...

This paper presents a compact planar design of 2-D Butler matrix steering the beam of a patch antenna array for D-band frequencies. The stripline Butler matrix feeding network is beneath the ...