Found the following HTML validation problems:
Alelager.html:39:1 (Alelager.Rd:9): Warning: trimming empty <li>
Alelager.html:38:1 (Alelager.Rd:9): Warning: trimming empty <ul>
Bangladesh.html:42:1 (Bangladesh.Rd:9): Warning: trimming empty <li>
Bangladesh.html:41:1 (Bangladesh.Rd:9): Warning: trimming empty <ul>
Batters2005.html:39:1 (Batters2005.Rd:9): Warning: trimming empty <li>
Batters2005.html:38:1 (Batters2005.Rd:9): Warning: trimming empty <ul>
Beerwings.html:39:1 (Beerwings.Rd:9): Warning: trimming empty <li>
Beerwings.html:38:1 (Beerwings.Rd:9): Warning: trimming empty <ul>
BookPrices.html:40:1 (BookPrices.Rd:10): Warning: trimming empty <li>
BookPrices.html:39:1 (BookPrices.Rd:10): Warning: trimming empty <ul>
Bushmeat.html:39:1 (Bushmeat.Rd:9): Warning: trimming empty <li>
Bushmeat.html:38:1 (Bushmeat.Rd:9): Warning: trimming empty <ul>
Bushmeat2.html:39:1 (Bushmeat2.Rd:9): Warning: trimming empty <li>
Bushmeat2.html:38:1 (Bushmeat2.Rd:9): Warning: trimming empty <ul>
Cameras.html:39:1 (Cameras.Rd:9): Warning: trimming empty <li>
Cameras.html:38:1 (Cameras.Rd:9): Warning: trimming empty <ul>
Cereals.html:39:1 (Cereals.Rd:9): Warning: trimming empty <li>
Cereals.html:38:1 (Cereals.Rd:9): Warning: trimming empty <ul>
Challenger.html:39:1 (Challenger.Rd:9): Warning: trimming empty <li>
Challenger.html:38:1 (Challenger.Rd:9): Warning: trimming empty <ul>
ChiMarathonMen.html:39:1 (ChiMarathonMen.Rd:9): Warning: trimming empty <li>
ChiMarathonMen.html:38:1 (ChiMarathonMen.Rd:9): Warning: trimming empty <ul>
Cuckoos.html:39:1 (Cuckoos.Rd:9): Warning: trimming empty <li>
Cuckoos.html:38:1 (Cuckoos.Rd:9): Warning: trimming empty <ul>
Diving2017.html:39:1 (Diving2017.Rd:9): Warning: trimming empty <li>
Diving2017.html:38:1 (Diving2017.Rd:9): Warning: trimming empty <ul>
Fatalities.html:39:1 (Fatalities.Rd:9): Warning: trimming empty <li>
Fatalities.html:38:1 (Fatalities.Rd:9): Warning: trimming empty <ul>
FishMercury.html:39:1 (FishMercury.Rd:9): Warning: trimming empty <li>
FishMercury.html:38:1 (FishMercury.Rd:9): Warning: trimming empty <ul>
FlightDelays.html:39:1 (FlightDelays.Rd:9): Warning: trimming empty <li>
FlightDelays.html:38:1 (FlightDelays.Rd:9): Warning: trimming empty <ul>
GSS2002.html:39:1 (GSS2002.Rd:9): Warning: trimming empty <li>
GSS2002.html:38:1 (GSS2002.Rd:9): Warning: trimming empty <ul>
GSS2006.html:39:1 (GSS2006.Rd:9): Warning: trimming empty <li>
GSS2006.html:38:1 (GSS2006.Rd:9): Warning: trimming empty <ul>
Girls2004.html:39:1 (Girls2004.Rd:9): Warning: trimming empty <li>
Girls2004.html:38:1 (Girls2004.Rd:9): Warning: trimming empty <ul>
Groceries.html:39:1 (Groceries.Rd:9): Warning: trimming empty <li>
Groceries.html:38:1 (Groceries.Rd:9): Warning: trimming empty <ul>
ILBoys.html:39:1 (ILBoys.Rd:9): Warning: trimming empty <li>
ILBoys.html:38:1 (ILBoys.Rd:9): Warning: trimming empty <ul>
IceCream.html:39:1 (IceCream.Rd:9): Warning: trimming empty <li>
IceCream.html:38:1 (IceCream.Rd:9): Warning: trimming empty <ul>
Illiteracy.html:39:1 (Illiteracy.Rd:9): Warning: trimming empty <li>
Illiteracy.html:38:1 (Illiteracy.Rd:9): Warning: trimming empty <ul>
Lottery.html:39:1 (Lottery.Rd:9): Warning: trimming empty <li>
Lottery.html:38:1 (Lottery.Rd:9): Warning: trimming empty <ul>
MathAnxiety.html:39:1 (MathAnxiety.Rd:9): Warning: trimming empty <li>
MathAnxiety.html:38:1 (MathAnxiety.Rd:9): Warning: trimming empty <ul>
Maunaloa.html:39:1 (Maunaloa.Rd:9): Warning: trimming empty <li>
Maunaloa.html:38:1 (Maunaloa.Rd:9): Warning: trimming empty <ul>
MnGroundwater.html:39:1 (MnGroundwater.Rd:9): Warning: trimming empty <li>
MnGroundwater.html:38:1 (MnGroundwater.Rd:9): Warning: trimming empty <ul>
MobileAds.html:39:1 (MobileAds.Rd:9): Warning: trimming empty <li>
MobileAds.html:38:1 (MobileAds.Rd:9): Warning: trimming empty <ul>
NBA1617.html:39:1 (NBA1617.Rd:9): Warning: trimming empty <li>
NBA1617.html:38:1 (NBA1617.Rd:9): Warning: trimming empty <ul>
NCBirths2004.html:39:1 (NCBirths2004.Rd:9): Warning: trimming empty <li>
NCBirths2004.html:38:1 (NCBirths2004.Rd:9): Warning: trimming empty <ul>
Nasdaq.html:39:1 (Nasdaq.Rd:9): Warning: trimming empty <li>
Nasdaq.html:38:1 (Nasdaq.Rd:9): Warning: trimming empty <ul>
Olympics2012.html:39:1 (Olympics2012.Rd:9): Warning: trimming empty <li>
Olympics2012.html:38:1 (Olympics2012.Rd:9): Warning: trimming empty <ul>
Phillies2009.html:39:1 (Phillies2009.Rd:9): Warning: trimming empty <li>
Phillies2009.html:38:1 (Phillies2009.Rd:9): Warning: trimming empty <ul>
Pitchers2005.html:39:1 (Pitchers2005.Rd:9): Warning: trimming empty <li>
Pitchers2005.html:38:1 (Pitchers2005.Rd:9): Warning: trimming empty <ul>
Quakes.html:39:1 (Quakes.Rd:9): Warning: trimming empty <li>
Quakes.html:38:1 (Quakes.Rd:9): Warning: trimming empty <ul>
Quetzal.html:39:1 (Quetzal.Rd:9): Warning: trimming empty <li>
Quetzal.html:38:1 (Quetzal.Rd:9): Warning: trimming empty <ul>
RangersTwins2016.html:39:1 (RangersTwins2016.Rd:9): Warning: trimming empty <li>
RangersTwins2016.html:38:1 (RangersTwins2016.Rd:9): Warning: trimming empty <ul>
Reading.html:39:1 (Reading.Rd:9): Warning: trimming empty <li>
Reading.html:38:1 (Reading.Rd:9): Warning: trimming empty <ul>
Recidivism.html:39:1 (Recidivism.Rd:9): Warning: trimming empty <li>
Recidivism.html:38:1 (Recidivism.Rd:9): Warning: trimming empty <ul>
Salaries.html:39:1 (Salaries.Rd:9): Warning: trimming empty <li>
Salaries.html:38:1 (Salaries.Rd:9): Warning: trimming empty <ul>
Sat2008.html:39:1 (Sat2008.Rd:9): Warning: trimming empty <li>
Sat2008.html:38:1 (Sat2008.Rd:9): Warning: trimming empty <ul>
Service.html:39:1 (Service.Rd:9): Warning: trimming empty <li>
Service.html:38:1 (Service.Rd:9): Warning: trimming empty <ul>
Skateboard.html:39:1 (Skateboard.Rd:9): Warning: trimming empty <li>
Skateboard.html:38:1 (Skateboard.Rd:9): Warning: trimming empty <ul>
Skating2010.html:39:1 (Skating2010.Rd:9): Warning: trimming empty <li>
Skating2010.html:38:1 (Skating2010.Rd:9): Warning: trimming empty <ul>
Spruce.html:39:1 (Spruce.Rd:9): Warning: trimming empty <li>
Spruce.html:38:1 (Spruce.Rd:9): Warning: trimming empty <ul>
Starcraft.html:39:1 (Starcraft.Rd:9): Warning: trimming empty <li>
Starcraft.html:38:1 (Starcraft.Rd:9): Warning: trimming empty <ul>
TV.html:39:1 (TV.Rd:9): Warning: trimming empty <li>
TV.html:38:1 (TV.Rd:9): Warning: trimming empty <ul>
TXBirths2004.html:39:1 (TXBirths2004.Rd:9): Warning: trimming empty <li>
TXBirths2004.html:38:1 (TXBirths2004.Rd:9): Warning: trimming empty <ul>
Titanic.html:39:1 (Titanic.Rd:9): Warning: trimming empty <li>
Titanic.html:38:1 (Titanic.Rd:9): Warning: trimming empty <ul>
Turbine.html:39:1 (Turbine.Rd:9): Warning: trimming empty <li>
Turbine.html:38:1 (Turbine.Rd:9): Warning: trimming empty <ul>
Verizon.html:39:1 (Verizon.Rd:9): Warning: trimming empty <li>
Verizon.html:38:1 (Verizon.Rd:9): Warning: trimming empty <ul>
Volleyball2009.html:39:1 (Volleyball2009.Rd:9): Warning: trimming empty <li>
Volleyball2009.html:38:1 (Volleyball2009.Rd:9): Warning: trimming empty <ul>
Walleye.html:39:1 (Walleye.Rd:9): Warning: trimming empty <li>
Walleye.html:38:1 (Walleye.Rd:9): Warning: trimming empty <ul>
Watertable.html:39:1 (Watertable.Rd:9): Warning: trimming empty <li>
Watertable.html:38:1 (Watertable.Rd:9): Warning: trimming empty <ul>
corrExerciseA.html:39:1 (corrExerciseA.Rd:9): Warning: trimming empty <li>
corrExerciseA.html:38:1 (corrExerciseA.Rd:9): Warning: trimming empty <ul>
corrExerciseB.html:39:1 (corrExerciseB.Rd:9): Warning: trimming empty <li>
corrExerciseB.html:38:1 (corrExerciseB.Rd:9): Warning: trimming empty <ul>
manatees.html:39:1 (manatees.Rd:9): Warning: trimming empty <li>
manatees.html:38:1 (manatees.Rd:9): Warning: trimming empty <ul>
wafers.html:39:1 (wafers.Rd:9): Warning: trimming empty <li>
wafers.html:38:1 (wafers.Rd:9): Warning: trimming empty <ul>