It's about 20,000,000 times as heavy as a Human Heart
In other words, 0.0059 megatonnes is 19,000,000 times the weight of a Human Heart, and the weight of a Human Heart is 0.0000000530 times that amount.(human; adult)
The average human heart weighs about 0.000000000310 megatonnes. Each minute, the heart pumps between 10 and 20 liters (3 to 5 gallons) of blood through its chambers.
It's about 30,000,000 times as heavy as a Hamster
In other words, the weight of a Hamster is 0.0000000300 times 0.0059 megatonnes.(for Syrian hamster, a.k.a. golden hamster, a.k.a. Mesocricetus auratus; adult)
An adult Syrian hamster has a typical weight of about 0.000000000200 megatonnes. Known for transporting food in the pouches of their cheeks so that they can bury it later, some hamsters can store up to 0.0000000300 megatonnes of food in their borrows.
It's about 35,000,000 times as heavy as a Billiard Ball
In other words, 0.0059 megatonnes is 36,194,152.2613090 times the weight of a Billiard Ball, and the weight of a Billiard Ball is 0.0000000276287725370760 times that amount.(American-style, WPA specifications)
Per the World Pool-Billiard Association, a billiard ball weight must weigh between 0.00000000015592237718750 megatonnes and 0.000000000170097138750 megatonnes. According to legend, the difficulty in obtaining elephant ivory for the manufacture of billiard balls in the 19th century inspired the search for a replacement material, which led to the development of the first industrial plastic.
It's about 35,000,000 times as heavy as a Puck (Hockey)
In other words, 0.0059 megatonnes is 36,194,152.2613090 times the weight of a Puck (Hockey), and the weight of a Puck (Hockey) is 0.0000000276287725370760 times that amount.(Ice hockey)
A standard ice hockey puck weighs between 0.00000000015592237718750 megatonnes and 0.000000000170097138750 megatonnes. Hockey pucks can be shot or passed at speeds of up to 160 kph (99 mph) during games.
It's about 40,000,000 times as heavy as a Baseball
In other words, 0.0059 megatonnes is 40,608,073.2687850 times the weight of a Baseball, and the weight of a Baseball is 0.0000000246256450873940 times that amount.(MLB rules)
Per Major League Baseball rules, a baseball must weigh between 0.0000000001417476156250 megatonnes and 0.000000000148834996406250 megatonnes. A major league pitcher can throw a baseball at up to 150 kph (91 mph) (with a fastball pitch), with record-setting pitches as fast as 171 kph (106 mph).
It's about 45,000,000 times as heavy as a Battery (D)
In other words, 0.0059 megatonnes is 43,700,000 times the weight of a Battery (D), and the weight of a Battery (D) is 0.00000002290 times that amount.(Alkaline)
A "D" size battery weighs 0.0000000001350 megatonnes. The D size battery is the oldest of the modern battery sizes, first invented by the National Carbon Company in 1898.
It's about 65,000,000 times as heavy as a Deck of Cards
In other words, the weight of a Deck of Cards is 0.0000000160 times 0.0059 megatonnes.(ISO 216 B8 size, a.k.a. "poker size" 63 x 88 mm, 52-card deck)
A deck of 52 ISO 216 B8-size playing cards weighs 0.0000000000940 megatonnes. Utilizing nearly 3,700 decks, the record-holding largest card tower was built in early 2010, stood over 3.5 m (11 ft), and weighed over 0.000000230 megatonnes.