Abstract: In this communication, a programmable 2-bit array antenna based on a highly integrated element with low profile and high efficiency is proposed. Based on a ring structure and four PIN diodes ...

US warns gangs: Rubio says strikes possible, aid to Ecuador ...

A brain teaser is a short, playful puzzle designed to challenge your mind and elicit a smile. It could be a riddle, a tricky question, a visual illusion, or a logic twist that nudges you to think ...

A brain teaser is a short, playful puzzle designed to make your mind stretch and smile. It could be a riddle, a tricky question, a visual illusion, or a logic twist that nudges you to think beyond the ...

Flying for free on Air Canada may soon be more expensive. Members of the airline’s Aeroplan rewards program are worried that upcoming changes will make it tougher for some to earn points.