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The question of the identity of Jack the Ripper has baffled police investigators, historians, and armchair detectives for over a century, even with media offering its own unique take on the killer's identity.

Scientists are involved in a never-ending quest to understand the vast universe the planet inhabits; it seems that for each answer science provides, even more questions arise.

A French army captain is stripped of his rank.

After a stroke leaves President Woodrow Wilson in a weakened position, First Lady Edith Wilson takes a leading role in the White House to complete the final months of her husband's term.

Examining the monuments built in tribute to Athena.

Dr. David Livingstone journeys across Africa and reporter Henry Stanley's quest to find him.

Developing nuclear weapons.

Revisiting enemy actions, from Pancho Villa's raid on a New Mexican town where 18 were killed, the War of 1812, to the 1945 deaths of six Oregonians when a Japanese bomb-ferrying balloon flew 6,000 miles to reach its victims.

Historians examine ancient rituals that involve altered consciousness.

Young men of Navajo descent create a military code.

Two antique telephones; a unique porcelain bowl made during the Ch'ien-lung dynasty; Chumlee will not leave work even though he doesn't feel well.

A look back at the biggest and most expensive items the Pawn Stars have ever seen; a million-dollar car-crushing machine dubbed Robosaurus; a cigar box owned by John F. Kennedy himself; a piece of sunken treasure.

A 1964 770 Amphicar comes into the shop; a 1939 National Bowling Association Championship Ring; Rick bets Corey and Chum can't go without their cellphones for the day.

A nightstick possibly owned by Ulysses S. Grant comes into the shop; a set of vintage skateboard stickers; Chumlee tries to prove that he is a multitasking master.

A look back at some of the coolest items Corey and Chumlee have ever seen; a one-of-a-kind Gibson guitar; a set of unopened Star Wars action figures; a pair of pistols.

A medal from British explorer Captain Cook comes into the shop; Chum checks out a golf putter from the famed 1963 Frank Sinatra Invitational; Chumlee tries to calm Rick down when his stress level hits a new high.

A letter from WWI fighter pilot Eddie Rickenbacker comes into the shop; Corey looks at a military swagger stick from 1865.

A print believed to be from Renaissance master, Raphael; negotiating for a 1970s Ibanez guitar; finding out the contents of Rick's will.

The book "The Big Bonanza" comes into the shop; an ancient Tibetan door comes in; the guys decide to find out who's the better driver when Corey gets a ticket.

A hovercraft zooms into the shop; Corey checks out a set of 1960s The Beatles bobble-heads; a new arcade game gets bought by the shop, and Rick lets the guys plug it in.

A guitar signed by bass player Garry Tallent arrives at the shop; Rick examines a replica of a 1964 Peace Dollar; Rick challenges Chum to a paper airplane contest.

A 1907 Saint-Gaudens coin makes its way onto the counters; a vintage pair of Ray-Ban sunglasses owned by President George Bush, Sr. comes in; Rick finds Chum's secret stash in the back.

A Civil War-era broadside is brought in; Rick checks out a 1947 fully restored Wurlitzer jukebox; Rick gets frustrated when Chumlee brings a kid into the pawnshop.

An autographed book written by master illusionist Harry Houdini arrives in the shop; Corey and Chumlee scope out a vintage x-ray unit; Chumlee takes a vow of silence.

Rick and Corey look at a BSA bike from WWII; Rick and Chumlee find a pair of Roberto Clemente prototype sneakers.

Corey and Chumlee must decide whether to purchase a Gene Autry guitar; Rick eyes a portrait by Red Skelton; Chumlee wants to sell his shoe collection in the shop.

Jarrod and Brandi uncover the ultimate guy's unit among the lockers in Santa Ana, Calif.; Darrell and Dave battle over a valuable antique.

The buyers battle in Costa Mesa, Calif.; a unit is filled with rock memorabilia; Darrell and Jarrod vie for an antique slide projector.

A new bidder hopes to dominate the competition; Darrell battles for a drum set; Jarrod and Brandi face a big loss.

The new bidder returns; Barry is intrigued by a locker with a hole in the wall; Jarrod pulls a sneaky trick.

Darrell suffers from bidder indecision; Barry's good-luck charm yields a reward; Jarrod and Brandi win big by going small.

An expensive jewelry box in discovered among the treasures in Huntington Beach, Calif.; Darrell attempts to reel in a unit; Barry eyes military antiques.

Barry becomes an organ donor; Jarrod and Brandi's profits roll away; Dave chooses not to deal; Darrell's fortunes rest on the flip of a coin.

A three-ring circus erupts when the buyers head to Irvine, Calif.; Darrell speculates that Dave has gone broke.

The buyers are in Upland, Calif.; Barry brings an advantage; Darrell gets shut out; Jarrod and Brandi fall in love with a furniture locker; Dave goes all out on a jewelry unit.

Dave doesn't buy; Jarrod and Brandi uncover rare Depression-era art; Barry's art goes back to the Mayan culture; Darrell uncovers a possible Wells Fargo stagecoach gun.

The bidders descend upon Laguna Hills, Calif.; Dave scores a furniture unit; Jarrod and Brandi stroll down memory lane.

The buyers venture into downtown Los Angeles, where they participate in a vault auction; Jarrod and Brandi put all their marbles in some mystery boxes.

The buyers journey to the affluent neighborhood of Westminster, Calif.; Barry discovers an antique medical device.

The buyers visit Ontario, Calif., where Darrell wants to take son Brandon to the next level of the business; Barry's unit is anything but chicken feed.