Two Fuses

You have a lighter and two fuses that take exactly one hour to burn, but they don’t burn at a steady rate. For example, one fuse could take 59 minutes to burn the first inch and then burn the rest of the fuse in the last minute.

How would you use these two fuses to measure 45 minutes?

Light the first fuse on both ends and the second fuse at only one end. When the first fuse burns out you know 30 minutes have passed. Light the other end of the second fuse and when it burns out, 45 minutes have passed.

Posted in Brain Teasers

Lucrezia Borgia

Lucrezia Borgia invited a prospective victim to lunch. They ate a hearty meal of roast venison, with a selection of fresh vegetables, all washed down with the finest wine imported from Bordeaux, France.

After the meal, they ate figs and freshly picked grapes.

“Just one apple left”, said Lucrezia, “I insist you have it.

“No”, said the guest, “I couldn’t”.

“Tell you what”, said Lucrezia, “we’ll share it”, and promptly sliced the apple in two with her sharpest knife. The guest and Lucrezia started to eat their respective halves when the guest’s eyes rolled towards the ceiling and he fell over, dead.

“Another victim successfully dispatched,” thought Lucrezia.

How did she do it?

She used a knife coated on just one edge with cyanide. When she sliced the apple in two, only the victim’s half was poisoned.

Posted in Brain Teasers

Winning at Wimbledon

As a result of temporary magical powers, you have made it to the Wimbledon finals and are playing Roger Federer for all the marbles. However, your powers cannot last the whole match. What score do you want it to be when they disappear, to maximize your chances of hanging on for a win?

It sounds obvious that you should ask to be ahead two sets to love (it takes 3 out of 5 sets to win
the men’s), and in the third set, ahead 5-0 in games and 40-love in the sixth game. (Probably you
want to be serving, but if your serve is like mine, you might prefer Roger to be serving the sixth
game down 0-40 so that you can pray for a double fault.)

Not so fast! These solutions give you essentially 3 chances to get lucky and win, but you can
get six chances—with three services by you and three by Roger. You still want to be up two sets
to none, but let the game score be 6-6 in the third set and 6-0—in your favor, of course—in the
tiebreaker.

Credit goes to Peter Winkler for creating this.

Posted in Brain Teasers

I Will Stomp You If You Get In My Way

I roam through the land hoping to rescue my love. I search high and low and will stomp on you if you get in my way. What am I?

Mario, from Super Mario Brothers video game by Nintendo. He roams the land searching for the princess and his primary method of getting rid of folks is to stomp on them.

Thanks to Rowan for figuring this out.

Posted in Riddles

Take Off My Clothes, Puts Its On

When I take off my clothes, it puts on its clothes.
When I put on my clothes, it takes off its clothes.

A clothes hanger.

Posted in Riddles

Days of Summer

My days are in the summer
When you’ll eat me when I’m hot
In fact I’ll even eat myself
Where battles tough are fought
But when you find me in a fight
‘Twill be high in the sky
And if you catch me napping
I suggest you let me lie
When you’re bad come to my house
From Ma get thoughts profound
Am I big or am I small?
Some say I’m just a pound.

Dog. Dog days, hot dog, dog pound, dog fight.

Posted in Riddles

Coffee

What does this represent?

COF FEE

Coffee break. The word coffee is broken into two pieces.

Posted in Brain Teasers
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The Barber of Seville

The Barber of Seville shaves all men living in Seville.
No man living in Seville is allowed to shave himself.
The Barber of Seville lives in Seville.

Who shaves the Barber of Seville?

Nobody. The Barber of Seville is a woman. Female barbers are rare, but they exist.

And for more fun with barbers, check out the Barber paradox.

Posted in Brain Teasers

Who May Enter?

A green glass door admits only certain objects. Apples and balls are allowed, but pears and bats aren’t. What determines whether an item can enter?

All words with a repeated letter are allowed. Green glass door, apple and ball.

Posted in Brain Teasers

One Hundred Point Words

The answer to each clue is a single, 100-point word, or a word whose letters add up to 100, with a = 1, b = 2. I wrote this word value calculator so you can easily check your guesses.

i. Peanut butter tastes like this.
ii. The hat a Dad wears.
iii. To fire a chef,
iv. A smart timepiece.
v. Figured it out again.
vi. Where a kid can sleep.
vii. The magical fruit leaves you doing this.
viii. Betrayed for this much silver.
ix. A baked good that is height challenged.
x. A sticky way to neaten your hair.

i. nutty
ii. fatherhood
iii. cookout
iv. clockwise
v. resolved
vi. boycott
vii. tooting
viii. thirty
ix. shortcake
x. honeycomb

Posted in Riddles