Math
You're right, an angle that is more than acute but less than obtuse has this many degrees
90
Tennis racket strings, though called this, are made out of cattle, sheep or hog intestines
catgut
Edible items you "spill" when you tell a secret
the beans
Casa Milà, also known as La Pedrera, "the quarry", is in this Spanish city known for its unusual architecture
Barcelona
Heinlein, Ellison & Pohl were masters of this genre
Science Fiction
In this notation system, 1/4 is .25, & is terminating
decimal
This yummy bird came to Europe from America, not Asia Minor, so maybe it should be called a "USA" or a "Mexico"
the turkey
Beware: someone who offers you this kind of "sandwich" wants to punch you
a knuckle sandwich
This desert covers about 500,000 square miles in China & southern Mongolia
the Gobi
College major shared by Barack Obama & Chris Christie--makes sense
Political Science
In the term 3x, the factor 3 is called x's this
coefficient
Though its name means "new star" it's just a star that flares up to many times its normal brightness
a nova
"One fell" this refers to the quick, fierce move a hawk makes when seizing its prey
swoop
People from Glasgow aren't called Glasgowians but this
Glaswegians
Everyone could see Thomas Dolby was poetry in motion with this 1983 Top 10 hit
"She Blinded Me With Science"
A figure is defined as this if it can be divided into 2 parts that are mirror images of each other
symmetrical
Despite its name, some paleontologists don't think this ancient animal was even part of the cat family
a saber-tooth tiger
The phrase "to come on like" these refers to the old-time radio program heard here
Gangbusters
There are 2 official languages spoken on Cyprus--Greek & this
Turkish
C'mon, we're only talking the Titan II & Saturn V! It's not this! Wait! It totally is!
Rocket Science
Devotees of this celebrate its irrational existence each 3/14 at 1:59 P.M.
pi
This cute rodent is a cavy from South America, not a sow from a country in Africa
a guinea pig
To give someone you dislike the credit he deserves is to "give the devil" this
his due
Kings reign over these 2 countries in Asia that both begin with "B" & end with "N"
Bahrain and Bhutan
Gloomily, Thomas Carlyle coined this phrase describing economics
The Dismal Science