U.S. Air Force says - Laser-armed fighter jets by 2020

The invention of guns took warfare to a whole new level. Later, airplanes radically changed it again. Now, experts say another big shift is coming, led by energy weapons, including lasers.

The U.S. Air Force Research Laboratory, or AFRL, said it's on track to demonstrate a working laser weapon on a fighter jet by 2020.

"It really is a national tipping point," said Kelly Hammett, chief engineer for the AFRL's directed energy directorate. "We see the technology evolving and maturing to the stage where it really can be used."

Arming larger planes with laser weapons has been possible for years. 

But the more difficult challenge is to create lasers small, accurate and powerful enough for fighter jets, Hammett said. The g-forces and vibrations of near supersonic speeds make that tough. Hammett said he thinks those hurdles can be overcome within five years.

The AFRL is also working on another idea that sounds like something from "Star Trek":

You might call it a defensive laser shield — as in, "Shields up, Mr. Sulu."

Here's how it would work: A 360-degree laser bubble would surround a U.S. warplane. That bubble would disable or destroy anything that comes inside, like a missile or another aircraft. 

Suarez is world's best striker - No Messi and no Neymar

No Lionel Messi, no Neymar, no matter. Luis Suarez stole the show for Barcelona as the Catalans eased past Guangzhou Evergrande in the semi-finals of the Club World Cup on Thursday. In the absence of the game's two finest footballers in 2015, the Uruguayan showed he is the best centre-forward around.

Suarez struggled for goals at the beginning of his Camp Nou career, but really got going after Christmas and ended the campaign with 25 in 43 games en route to the club's treble triumph. It was an impressive return and aside from scoring, he does so much more for the team.

"Suarez gives us a lot," Luis Enrique said in October. "What he gives us is priceless, non-negotiable. He gives us power inside the box, he's irreplaceable. And he does a lot of good defensive work as well."

And he scores goals, of course. The Uruguayan now has 22 in just 23 games in 2015-16 (and 15 in his last 10 appearances) to close in on his mark from last season with over half of the campaign still ahead. At his current rate, he is on target to net 50 goals or more this term.

Guus Hiddink in two minds over succeeding Mourinho - "Chelsea are in a bad situation"

The former Real Madrid manager, who is heavy favourite to take over as the Portuguese's replacement at Stamford Bridge, admits he is unsure whether he wants the job

Guus Hiddink has admitted he is in two minds over taking the vacant manager's role at Chelsea given their "bad situation".

The former Real Madrid and PSV boss has been strongly linked with taking over at Stamford Bridge following the sacking of Jose Mourinho on Thursday.