5 Things to Know This Morning

— -- Your look at the five biggest and most buzz-worthy stories of the morning.

1. 175-Pound Pit Bull Hulk Shatters Misconceptions About the Breed

This dog just may be the world's largest Pit Bull. Only 18-months-old, Hulk weighs a hefty 175 pounds.

Despite his intimidating size, his owners Marlon Grannan and his wife Lisa Grannan say Hulk is a sweet family dog and a best friend to their 3-year-old son Jordan.

2. Different Views of Bombing Suspect to Be Given at Trial

Two dramatically different portraits of Boston Marathon bombing suspect Dzhokhar Tsarnaev are expected to emerge when prosecutors and Tsarnaev's lawyers give their opening statements at his federal death penalty trial.

Was he a submissive, adoring younger brother who only followed directions given by his older, radicalized brother? Or was he a willing, active participant in the attacks?

The trial that begins today is expected to be one of the most closely watched terror cases in years.

3. LAPD Shooting: Homeless Victim Stole French Man's Identity, Authorities Say

The homeless man fatally shot by Los Angeles police officers in a Sunday confrontation was living in the United States under the assumed identity of a French national, authorities told ABC News Tuesday.

The LAPD had identified the man as Charley Saturmin Robinet, a convicted bank robber who carried a French passport.

But Astrid le Moine, Press Attaché for the Consulate General of France in Los Angeles, said the French consulate later notified police of the usage of the stolen identity.

4. Turkish Airlines Jet Skids Off Runway, Passengers Escape to Safety

A Turkish Airlines jet landing in dense fog in the Nepalese capital Wednesday skidded off a slippery runway but there were no serious injuries, officials said.

The plane, Flight TK726, was carrying 238 people on board and coming from Istanbul when the accident happened.

Passengers slid to safety on emergency slides.

5. What You Need to Know About the Challenge to Obamacare in Supreme Court

The Affordable Care Act, a.k.a. Obamacare, dodged a bullet in 2012 when the Supreme Court upheld the individual mandate. Wednesday, it faces a second major legal challenge; this one to the taxpayer-funded premium subsidies that underpin the entire law.

The nine justices will hear arguments over whether it’s legal to give out the subsidies in 34 states where the federal government established and runs the insurance exchanges, HealthCare.gov.

The debate centers on interpretation of a four-word phrase buried in the 2000-page law that says financial aid is available through “exchanges established by the state.”