Blog: Challenge Questions

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04/30/2018 5:01 PM Ancient Arithmetic: Newsletter Challenge (May 2018)
Last post: 05/10/2018 11:37 AM
24 1898
03/31/2018 5:01 PM Pollination Puzzle: Newsletter Challenge (April 2018)
Pathfinder Tags: challenge question pollination
Last post: 04/04/2018 4:00 PM
16 1467
02/28/2018 5:01 PM Core Conundrum: Newsletter Challenge (March 2018)
Pathfinder Tags: challenge question planet core
Last post: 03/02/2018 11:00 AM
7 1262
01/31/2018 5:01 PM Electric Bill Enigma: Newsletter Challenge (February 2018)
Last post: 02/07/2018 5:30 PM
41 2609
12/31/2017 5:01 PM Fuddled Frequencies: Newsletter Challenge (January 2018)
Pathfinder Tags: challenge question frequency
Last post: 01/23/2018 5:15 PM
176 3076
11/30/2017 5:01 PM Stumped by the Screen: Newsletter Challenge (December 2017)
Pathfinder Tags: challenge question lcd Screen
Last post: 12/07/2017 12:54 PM
16 997
10/31/2017 5:01 PM Flying in the Shadow of the Moon: Newsletter Challenge (November 2017)
Pathfinder Tags: challenge question eclipse
Last post: 11/07/2017 11:29 AM
16 1553
09/30/2017 5:01 PM Mystical Magnetic Fields: Newsletter Challenge (October 2017)
Last post: 10/10/2017 11:59 AM
13 2411
08/31/2017 5:01 PM Turbofan Tips: Newsletter Challenge (September 2017)
Pathfinder Tags: challenge question turbofan
Last post: 09/07/2017 5:37 PM
19 1419
07/31/2017 5:01 PM Mystery of the Part-time Stud Finder: Newsletter Challenge (August 2017)
Pathfinder Tags: challenge question Screen
Last post: 09/05/2017 2:06 PM
30 3624
06/30/2017 5:01 PM Tricky Tubes: Newsletter Challenge (July 2017)
Pathfinder Tags: challenge question CRT tv
Last post: 07/21/2017 9:12 AM
36 1765
05/31/2017 5:01 PM Satellite Struggle: Newsletter Challenge (June 2017)
Pathfinder Tags: challenge question satellite
Last post: 05/31/2017 8:21 PM
3 987
04/30/2017 5:01 PM Frustrating Fastballs: Newsletter Challenge (May 2017)
Pathfinder Tags: baseball challenge question
Last post: 06/02/2017 5:14 AM
27 2372
03/31/2017 5:01 PM Baffling Beer Glasses: Newsletter Challenge (April 2017)
Pathfinder Tags: beer challenge question optics
Last post: 04/25/2017 9:55 AM
27 2378
03/30/2017 5:46 PM Answer: Prime Partition, March 2017 Challenge Question
Last post: 04/03/2017 9:08 AM
8 451
02/28/2017 5:01 PM Puzzling Prime Partition: Newsletter Challenge (March 2017)
Last post: 04/06/2017 1:28 AM
27 1139
01/31/2017 5:01 PM Tropical Sun: Newsletter Challenge (February 2017)
Pathfinder Tags: challenge questions tropics
Last post: 02/03/2017 2:03 PM
6 1649
12/31/2016 5:01 PM Perplexing Propagation: Newsletter Challenge (January 2017)
Pathfinder Tags: challenge questions radio
Last post: 03/01/2017 1:33 AM
49 1928
12/01/2016 12:00 AM Crypto Conundrum: Newsletter Challenge (December 2016)
Pathfinder Tags: challenge questions
Last post: 12/05/2016 5:08 AM
10 970
10/31/2016 12:00 AM Natural Variations: Newsletter Challenge (November 2016)
Pathfinder Tags: challenge questions
Last post: 12/22/2016 7:49 PM
18 1174
10/01/2016 12:00 AM The Occasional Spark: Newsletter Challenge (October 2016)
Pathfinder Tags: challenge questions
Last post: 10/16/2016 2:08 PM
20 2005
09/01/2016 12:00 AM Sluggish Growth: Newsletter Challenge (September 2016)
Pathfinder Tags: challenge questions
Last post: 09/28/2016 2:56 PM
10 1437
08/01/2016 12:00 AM Pulsar Astronomy: Newsletter Challenge (August 2016)
Pathfinder Tags: challenge questions
Last post: 01/09/2017 6:13 PM
14 1496
07/01/2016 12:00 AM Rope Race: Newsletter Challenge (July 2016)
Pathfinder Tags: challenge questions
Last post: 07/20/2016 4:28 AM
62 2060
06/01/2016 12:00 AM Invisible Neutrino: Newsletter Challenge (June 2016)
Pathfinder Tags: challenge questions
Last post: 07/09/2016 1:57 PM
183 4195
05/01/2016 12:00 AM Permanent Magnet: Newsletter Challenge (May 2016)
Pathfinder Tags: challenge questions Magnets
Last post: 05/24/2016 11:33 AM
46 4024
04/01/2016 12:00 AM Gliese 581g: Newsletter Challenge (April 2016)
Pathfinder Tags: challenge questions
Last post: 04/19/2016 9:32 AM
17 1973
02/29/2016 4:59 PM Liquid in Motion: Newsletter Challenge (March 2016)
Pathfinder Tags: challenge questions
Last post: 04/10/2016 9:18 PM
40 3201
02/01/2016 12:00 AM Baseball Spin: Newsletter Challenge (February 2016)
Pathfinder Tags: baseball challenge questions
Last post: 06/09/2016 5:41 PM
50 2413
01/01/2016 12:00 AM Handel's Tune: Newsletter Challenge (January 2016)
Pathfinder Tags: challenge questions
Last post: 02/23/2016 9:54 PM
44 3224
11/30/2015 12:00 AM Three Spheres: Newsletter Challenge (December 2015)
Pathfinder Tags: challenge questions
Last post: 01/27/2016 11:30 AM
16 2262
11/01/2015 12:00 AM Tropical Cyclone No Fly Zone: Newsletter Challenge (November 2015)
Last post: 12/16/2016 6:18 PM
13 1913
10/01/2015 12:00 AM Pack Your Bags: Newsletter Challenge (October 2015)
Pathfinder Tags: challenge questions
Last post: 04/19/2016 3:10 PM
60 2251
09/01/2015 12:00 AM Mars Farms: Newsletter Challenge (September 2015)
Pathfinder Tags: challenge question
Last post: 12/20/2015 6:52 PM
74 2278
08/01/2015 12:00 AM Coin Flips for Cash: Newsletter Challenge (August 2015)
Pathfinder Tags: challenge question
Last post: 08/25/2015 1:59 PM
22 2218
07/01/2015 12:00 AM Apollo 11 Communications Log- Gimbal Lock: Newsletter Challenge (July 2015)
Pathfinder Tags: challenge questions NASA
Last post: 07/21/2015 9:06 PM
11 2895
06/01/2015 12:00 AM Airbag Physics: Newsletter Challenge (June 2015)
Pathfinder Tags: challenge question
Last post: 06/06/2015 11:25 PM
27 3056
05/01/2015 12:00 AM Styrofoam Slide (May 2015)
Pathfinder Tags: challenge question
Last post: 06/27/2015 2:17 PM
49 2336
04/01/2015 12:00 AM 100 Meter Dash: Newsletter Challenge (April 2015)
Pathfinder Tags: challenge question
Last post: 04/28/2015 4:36 PM
38 2196
02/28/2015 5:01 PM 3464-Cube: Newsletter Challenge (March 2015)
Last post: 03/17/2015 10:43 PM
21 1753
02/01/2015 12:00 AM Jovian System: Newsletter Challenge (February 2015)
Pathfinder Tags: challenge question
Last post: 03/09/2017 9:38 AM
42 2253
01/01/2015 12:00 AM Launch Location: Newsletter Challenge (January 2015)
Pathfinder Tags: challenge question
Last post: 01/13/2015 11:58 AM
11 1842
12/01/2014 12:00 AM Autumnal Glow: Newsletter Challenge (December 2014)
Pathfinder Tags: challenge question
Last post: 12/21/2014 12:14 AM
63 2314
11/01/2014 12:00 AM Icy Imbalance: Newsletter Challenge (November 2014)
Pathfinder Tags: challenge questions
Last post: 11/26/2014 4:31 AM
20 3346
10/01/2014 12:00 AM The Merlin Rocket Engine: Newsletter Challenge (October 2014)
Pathfinder Tags: challenge question
Last post: 10/28/2014 4:03 PM
46 3002
09/01/2014 9:00 AM Balloon Ride: Newsletter Challenge (September 2014)
Pathfinder Tags: challenge question
Last post: 09/23/2014 11:25 AM
40 4437
08/01/2014 12:00 AM The Sprinkler Mystery: Newsletter Challenge (August 2014)
Pathfinder Tags: challenge question
Last post: 09/04/2014 11:22 AM
144 5053
06/30/2014 12:00 AM Space Trail: Newsletter Challenge (July 2014)
Pathfinder Tags: challenge question
Last post: 08/10/2014 1:22 AM
21 3207
06/01/2014 12:00 AM Rolling, Rolling, Rolling...: Newsletter Challenge (June 2014)
Pathfinder Tags: challenge questions
Last post: 07/06/2014 11:39 PM
138 4660
05/01/2014 12:00 AM Supercooled Water: Newsletter Challenge (May 2014)
Pathfinder Tags: challenge questions
Last post: 06/12/2014 9:19 AM
37 4221
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