Top 100 presentations

1. Continuous Verb Tenses
   35304
2. Support and transport in plants
   33787
3. Anyong Tubig Anyong Lupa sa Asya
   29285
4. Elements compounds and mixtures
   25983
5. Chromosome
   21962
6. Simple Verb Tenses
   20783
7. Atomic Structure
   20186
8. Balancing Chemical Equations. Balancing redox equations
   20107
9. Periodic Behavior
   19874
10. Newton’s laws of motion
    18836
11. Periodic Trends
    16736
12. Adverbs
    16634
13. Percent Composition, Empirical and Molecular Formulas
    15969
14. Animal Farm
    15768
15. Bonding, Molecular Shape & Structure
    14716
16. Circulation and Gas Exchange
    13401
17. MakingFood
    13382
18. DNA - An overview
    13029
19. Fungi
    12861
20. Atomic Structure and Periodic Trends
    12815
21. Volumetric
    12648
22. Feminism- Cure or Curse
    12535
23. Atomic Structure and Periodicity
    12478
24. Hormones and the Endocrine System
    12115
25. Animal Development
    12022
26. Derivation Applications of Bernoulli Principal
    11887
27. Osmoregulation and Excretion
    11445
28. Plasma Membrane-Gateway to the Cell
    10770
29. Plant Structure, Growth, and Development
    10692
30. Acid, bases and salts
    10225
31. Development
    10198
32. Mirrors and Lenses
    10115
33. Structure of the Atom
    9920
34. Balanced forces
    9886
35. Ancient Civilizations
    9807
36. Mass Spectrometry
    9746
37. Pronouns
    9723
38. Nouns
    9667
39. Resource Acquisition and Transport in Vascular Plants
    9471
40. Forests
    9371
41. Support and transport in plants
    9331
42. Atomic Structure
    9290
43. Cell Types and Cell Structure
    8982
44. Newton’s third law of motion
    8914
45. Animal Nutrition
    8673
46. Transplantation Immunology
    8617
47. Cellular respiration
    8493
48. Growing Plants
    8342
49. Sensory and Motor Mechanisms
    8304
50. Electrical Circuits
    8236
51. Plant Responses to Internal and External Signals
    8131
52. Lab Equipment
    8026
53. Prepositions
    7973
54. Viruses, Viroids, and Prions
    7874
55. Neurons, Synapses, and Signaling
    7848
56. Of Mice and Men
    7798
57. A Tour of the Cell
    7674
58. Basic Structure of a Cell
    7644
59. Real time PCR and it's functions in diagnosis
    7592
60. Covalent Bonding (Molecules)
    7574
61. Plant structure adaptations and responses
    7533
62. Ionic Bonding
    7438
63. Cellular Division
    7418
64. Mendelian Genetics
    7076
65. To Kill a Mockingbird
    7043
66. Blood Type Genetics
    7008
67. Satellite Orbits and Uses NIS
    7000
68. Molecules and Ions
    6907
69. Well logging The Bore Hole
    6887
70. Sound
    6857
71. The Immune System
    6803
72. Membrane Structure and Function
    6732
73. Animal Reproduction
    6698
74. The Chemistry of Acids and Bases
    6648
75. Angiosperm Reproduction and Biotechnology
    6632
76. Rocks
    6598
77. Mendel and the Gene Idea
    6566
78. Plant Diversity
    6562
79. Cell Communication
    6501
80. Balancing Chemical Equations
    6479
81. Rate Laws
    6352
82. Drama
    6315
83. Hybridization of Orbitals
    6299
84. Introduction to Oscillations and Simple Harmonic Motion
    6294
85. The Building Blocks of Matter Atoms
    6220
86. Empirical Formula
    6205
87. Electron Quantum Numbers
    6153
88. An Introduction to Metabolism
    6110
89. Translation. Protein from RNA
    6080
90. Neurons
    6024
91. The Structure and Function of Large Biological Molecules
    5943
92. The Mole
    5899
93. Photosynthesis
    5873
94. Cell Membrane + Tissues & Organs Definitions
    5865
95. Earthquakes
    5826
96. Karyotypes
    5824
97. ADP, ATP and Cellular Respiration
    5792
98. Endocrine System
    5749
99. Classical greek philosophy
    5671
100. Population Ecology
     5634

Research and Development, Experimental aerospace engineering center in Serbia (Space Technologies)